Questions on Algebra: Trigonometry answered by real tutors!

Tutors Answer Your Questions about Trigonometry-basics (FREE)

Question 150754: sin^2 pi/3 + cos^2 pi/3. Use identity to find of the value of the expression (no calculator)
Click here to see answer by vleith(2825)

Question 150899: natural base (e): e^-0.95=?
Click here to see answer by jim_thompson5910(28595)

Question 150898: verify the identity
sin x/1-cot x- cos x/tan x-1 = sin x + cos x
Click here to see answer by vleith(2825)

Question 150901: tan 11pi/6
Click here to see answer by jim_thompson5910(28595)

Question 151155: sin(60 degree-45 degree)
Click here to see answer by jim_thompson5910(28595)

Question 151157: sin75 degree=?
Click here to see answer by jim_thompson5910(28595)

Question 151156: sin105 degree=?
Click here to see answer by jim_thompson5910(28595)

Question 149422: If we establish an identity:
(tan A - cot A/tan A + cot A) would equal what?
Click here to see answer by jojo14344(1512)

Question 151161: tan ((5pi/3)-pi/4))
Click here to see answer by checkley77(12569)

Question 150174: Please help me solve this problem!
If we establish an identity, -sin A csc A - sin^2 A - cos^2 A - tan A cot A would equal which of the following:
1. -2 + 2 sin^2 A
2. -3
3. 3 cos^2 A - 1
4. 3 cos^2 A - 2 sin^2 A
Thank you, Lennie
Click here to see answer by jojo14344(1512)

Question 151160: tan ((4pi/3)-pi/4))
Click here to see answer by checkley77(12569)

Question 151392: tan(pi/6 + pi/4)
Click here to see answer by jim_thompson5910(28595)

Question 151396: how do i solve using one of the 6 sum/diff identities and not the calculator?
tan(5pi/3 - pi/4)
Click here to see answer by stanbon(57361)

Question 151205: sin(x+y)-2sinx+sin(x-y)/cos(x+y)-2cosx+cos(x-y)= tan x
Click here to see answer by Edwin McCravy(8909)

Question 152165: System of Linear Equations:
Solve the system using the addition method.
2x+3y=-16
5x-10y=30
Click here to see answer by jim_thompson5910(28595)

Question 151158: tan ((pi/6)+pi/4))
Click here to see answer by orca(409)

Question 152749: from a 100 foot roof of a building on the coast, a tourist sights a ship. the angle of depression is 2.5 degrees. how far is the ship from the shoreline?
i put x/100 = tan 2.5 degress than cross multiplied and got 4.4 feet. id that right?
Click here to see answer by Alan3354(30993)

Question 152747: if tan = 6/5 and cos < 0 how do i find csc and sin, because i know cot and sec are the recipricols of tan and cos?
Click here to see answer by Alan3354(30993)

Question 152881: I HAVE BEEN GIVEN A TABLE WHICH SHOWS THE MEDIAN "B.M.I" (BODY MASS INDEX) FOR FEMALES OF DIFFERENT AGES IN THE U.S IN THE YEAR 2000 . THE QUESTION IS USE TECHNOLOGY TO PLOT THE DATA POINTS ON A GRAPH?? . DEFINE ALL VARIABLES USED AND STATE ANY PARAMETERS CLEARLY??what type of function ,models the behavior of the graph? explain why one chose this function?
AGE B.M.I
2 16.40
3 15.70
4 15.30
5 15.20
6 15.21
7 15.40
8 15.80
9 16.30
10 16.80
11 17.50
12 18.18
13 18.70
14 19.36
15 19.88
16 20.40
17 20.85
18 21.22
19 21.60
20 21.65

Click here to see answer by jim_thompson5910(28595)

Question 152986: find exact value:
tan(pi/3+pi/4)
Click here to see answer by orca(409)

Question 153272: This is what my paper says...
Find each angle measure to the nearest degree.
1) tan A=2.0503
Click here to see answer by Earlsdon(6287)

Question 153272: This is what my paper says...
Find each angle measure to the nearest degree.
1) tan A=2.0503
Click here to see answer by stanbon(57361)

Question 153413: sin of theta = 0.7586
i dont know what to do?
Click here to see answer by stanbon(57361)

Question 153461: -60001000000 x 10 to the power of ten how do youy write that
Click here to see answer by stanbon(57361)

Question 153859: A space shuttle 240 miles above the earth orbits the earth every 5 hours. How far (to the nearest 10 miles) does the shuttle travel in 1 hour? ( The diameter of the earth is approximately 8000 miles)[Theta=s/r]
Click here to see answer by vleith(2825)

Question 153874: Simplify the expression.
Cos(2arctan(x))

arctan is just the inverse of tan Example tan^-1
i keep getting (1-x^2)/(1+x) althoutgh it keeps saying that its wrong
Click here to see answer by stanbon(57361)

Question 153914: The formula: R (sub a) = R (sub f)sqrt{1-(v/c)^2}
expresses the aging rate of an astronaut. R (sub a), relative to the aging rate of a friend on Earth, R (sub f), where v is the astronaut;s velocity and c is the speed of light.
a. Find lim_v-c R (sub a)
b. If you are traveling in a starship at velocities approaching the speed of light, what does the limit in part a indicate about your aging rate relative to a friend on Earth?
c. Explain why a left-hand limit is used in part a.
I know it's long but thanks for everyone's help.
Click here to see answer by stanbon(57361)

Question 153916: Help with sequences, induction and probability?
i have a figure with 4 squares:
square 1: 3 in wide
square 2: 6 in wide
square 3: 9 in wide (yellow)
square 4: 12 in wide
find the probability that a dart will land in the yellow region.
Click here to see answer by Earlsdon(6287)

Question 153789: A kite on a 250 foot string makes a 58° angle with the ground. What is the height of the kite above the ground to the nearest foot?
Click here to see answer by orca(409)

Question 153938: I dont understand this question....
3v^3 - 6v^2 + 2v - 4
My teacher would like me to factor each completely.... I dont understand how to do this problem..... please get back to me asap
Click here to see answer by scott8148(6628)

Question 153998: I need to subtract two rational expressions, and the problem is
((3a+2b)/(3b)) - ((a+2b)/(6a))
I do not understand how to find the lowest common denominator, and what to do after I do find it.
Click here to see answer by checkley77(12569)

Question 154018: Solve for n:
m+3=mn-5n
Click here to see answer by oscargut(891)

Question 154018: Solve for n:
m+3=mn-5n
Click here to see answer by jojo14344(1512)

Question 154018: Solve for n:
m+3=mn-5n
Click here to see answer by checkley77(12569)

Question 153929: find the sum of the geometric series.

Click here to see answer by Edwin McCravy(8909)

Question 154114: Verify the identity help needed?

sinx+siny/sinx-siny= tan(x+y/2)cot(x-y/2)
Click here to see answer by orca(409)

Question 154116: help verifying the identity
sin^2(theta/2)=csc(theta)-cot(theta)/2csc theta
Click here to see answer by orca(409)

Question 154158: What is the linear speed in miles per hour of a bicycle with 28 inch wheels turning at 180 revolutions per minute
Click here to see answer by checkley77(12569)

Question 154159: What pedaling speed in rotations er minute must a racer maintain to make the rear wheel turn at 150 revolutions per minute?
Click here to see answer by stanbon(57361)

Question 154098: A tower 48m high casts shadow 55m long. Find the angle of elevation of the sun.
Click here to see answer by Alan3354(30993)

Question 154250: The following is a table
complete the table (I'm wondering if I could just use a like trig circle the kind with the degree and radians and its equavlant in sine an cosine)
Sin Cos Tan Sec csc cot
0 degress | | | | | |
It wouldn't set each word set under the space in the chart but thats the jist of it.
I tried the circle but I'm confused as if there is more to go after that.
Click here to see answer by Edwin McCravy(8909)

Question 154247: I'm grouping these two problems together since they are from the same section. I'm drawing big blanks for these problems and have rounded up all my notes for them and still I'm confused.
The first is a triangle on a quadrant of the coordinate plane.

A right triangle with a hypotenuse of 5 and a base on the x coordinate of 4 the angle at the origin is not given. I'm instructed to find the six trig functions of that angle. I'm like thinking something along the lines of solve for angle measure and then I'm lost.
The second one is find the values of an angle 0 (with the line trough it) in standard position whos terminal side passes through point p with P at (8,15)
Click here to see answer by stanbon(57361)

Question 154156: Find theta if omega=100 revolutions per second and t=2 seconds
Click here to see answer by Alan3354(30993)

Question 154264: rotation of axes question.

write equation in terms of rotated x' y' system using theta, the angle of rotation. Write the equation ?
involving x' y' in standard form.
; θ = 45°
Click here to see answer by Edwin McCravy(8909)

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