Questions on Algebra: Trigonometry answered by real tutors!

Tutors Answer Your Questions about Trigonometry-basics (FREE)

Question 190769: simplify (1+sinx/cosx)+(cosx/1+sinx)
Click here to see answer by Edwin McCravy(8880)

Question 190781: (1/sinx) - sinx = cos²x/sinx
Click here to see answer by stanbon(57219)

Question 190771: simplify secα(sinα/tanα)
Click here to see answer by Alan3354(30959)

Question 190811: Can someone please help:
The voltage needed to produce a current of 8 A in a resistance of 12 ohms is:
a. 0.67 V.
b. 1.5 V.
c. 4 V.
d. 96 V.

Click here to see answer by orca(409)

Question 190819: Can you help me complete this identity?
1)secx - 1/sec x=?

Click here to see answer by jim_thompson5910(28476)

Question 191182: I need to prove that: sin^2(x/2)=(csc(x)-cot(x))/(2csc(x))
Click here to see answer by orca(409)

Question 191668: I need your help in how to solve the question
Solve over the interval [0,360]
sin 2x = cos 2x +1
Click here to see answer by J2R2R(94)

Question 191792: Evaluate cos^-1(square root 2/2) in both radians and degrees if it exists.
Click here to see answer by jim_thompson5910(28476)

Question 191467: Solve i tried sec^2 theta = tan^2 + 1 so tan^2 theta =3 but i do not know what to do from here on.
Click here to see answer by Alan3354(30959)

Question 191882: Evaluate cos-1(square root 2over 2) in both radians and degrees if it exists.
Click here to see answer by jim_thompson5910(28476)

Question 192016: Graph y=3csc(x). Determine its period and asymptotes.
Click here to see answer by Alan3354(30959)

Question 192086: Express sin 4theta as a function of theta.
Click here to see answer by orca(409)

Question 192147: Find the vertex, focus and directrix of the parabola. [NOTE: fractions must be reduced and mixed numbers have to be reported as improper fractions]
y = x2 - 20x + 10
Click here to see answer by Mathtut(3670)

Question 192090: **just for starters in the equation that i am about to show you, i am using the 0 symbol as the theta/angle symbol (also in question A))**
For sin0+cos0cot0=csc0, do the following
A) Show that the equation is true when 0= thirty degrees
B) Prove the equation algebraically
C) State any restrictios that are in the equation
Click here to see answer by Alan3354(30959)

Question 192204: help
Click here to see answer by Mathtut(3670)

Question 192148: Find the vertex, focus and directrix of the parabola. [NOTE: fractions must be reduced and mixed numbers have to be reported as improper fractions]
y2 - 18y - 9x - 81 = 0
Click here to see answer by stanbon(57219)

Question 192758: the graph of y= cosx is increasing on the interval (o,pi)
Click here to see answer by Alan3354(30959)

Question 193278: Find the points of intersection of the graphs of the equations. [separate your answers with a semicolon]:
x2 + 5y2 = 36
x2 + y2 = 12
Click here to see answer by RAY100(1637)

Question 193277: Find the points of intersection of the graphs of the equations. [separate your answers with a semicolon]:
x2 + 4y2 = 100
x + 2y = 10
Click here to see answer by RAY100(1637)

Question 193369: Show that 1+tan^2 (theta)=sec^2(theta) for 76.5 degrees.
Click here to see answer by solver91311(16868)

Question 193414: 2+9
Click here to see answer by Alan3354(30959)

Question 193897: Find sin49 degree without using calculator?
Click here to see answer by vleith(2825)

Question 194093: Find the points of intersection of the graphs of the equations. [Separate your answers with a semicolon (;). ]
y2 - 5x2 = 25
y - x = 5
I already found one answer: (0,5) but the computer says there is a second answer. any help would be greatly appreciated
Click here to see answer by edjones(7569)

Question 194101: The hypotenuse of a right triangle is (c) and one (a)leg is 24 and other (b)leg is 32.
Find the sin A and tan A
also
a= 2.8m, B= 41.8 degrees
and
The hypotenuse of a right triangle is 46.0in and one leg is 35.4 Find the length of the other leg.
Click here to see answer by RAY100(1637)

Question 194206: Express the angle that the second hand on a watch turns in 25 s, in radian measure in exact form, and in approximate form, to the nearest hundredth of a radian.
Click here to see answer by Alan3354(30959)

Question 194208: A small electric motor turns at 1500 revolutions/min. Express the angular velocity, in radians per second, in exact form.
Click here to see answer by Alan3354(30959)

Question 194207: The earth has a radius of approximately 6400 km. How many radians per second is the earth rotating at the equator? What is the speed of the earth, in kilometres per hour? If the earth rotates 2, how many kilometres has it rotated at the origin?
Click here to see answer by Alan3354(30959)

Question 194376: A point on the terminal side of angle ϴ is given. Find the exact value of the indicated trigonometric function.
a. (-4,5) find tan ϴ
Click here to see answer by stanbon(57219)

Question 194375: A fossilized leaf contains 27% of its normal amount of carbon 14. How old is the fossil (to the nearest year)? Use 5600 years as the half-life of carbon 14.
Click here to see answer by stanbon(57219)

Question 194509: I do not get how to prove that left side is equal to right side:
tan²@ - sin²@ = sin²@*tan²@

Click here to see answer by RAY100(1637)

Question 194509: I do not get how to prove that left side is equal to right side:
tan²@ - sin²@ = sin²@*tan²@

Click here to see answer by Edwin McCravy(8880)

Question 194670: If 10cos(theta)=-5√3, then what are the solutions for 0 degrees ≤ theta ≤ 360 degrees?
Click here to see answer by stanbon(57219)

Question 194684: Solve the equation cos ?(2sin ? +√3)(-√2 cos ? + 1) = 0 for 0 = x = 2π.
Click here to see answer by solver91311(16868)

Question 194692: What is the double angle formula derived from the sine and cosine subtraction formulas?
Click here to see answer by solver91311(16868)

Question 194801: I'm trying to plot points on a graph. the problem is y=3sec4x. I have all the points but one. I'm stuck at 5 pi/2. I have no idea how to find this on the unit circle. Explain plz?
Click here to see answer by solver91311(16868)

Question 194974: How do you verify cos(A+B)+cos(A-B)=2cosAcosB
Click here to see answer by jim_thompson5910(28476)

Question 195263: Solve, for degree between zero and 360, the equation
Click here to see answer by Edwin McCravy(8880)

Question 195285: population growth rates and compounding interest is an example of?
Click here to see answer by jim_thompson5910(28476)

Question 195527: Two boys are on opposite sides of a tower.They sight the top of the tower at 33 degree's and 24 degree angles of elevation respectively.If the height of the tower is 100 m, find the distance between the two boys.
Click here to see answer by ankor@dixie-net.com(15624)

Question 194699: i m not sure which formula i used can u solve this for me and tell me the formula please.
using formulas evalute
a. sin 11π/12
b. tan [-5π/12]

Click here to see answer by Alan3354(30959)

Question 195734: find the reference angle of 25 pi / 4
Click here to see answer by stanbon(57219)

Question 195808: solve: 2 cos(squared)t-9 cos t = 5
Click here to see answer by solver91311(16868)

Question 195806: solve: 3 sin x - 2 = 7 sin x -1
Click here to see answer by RAY100(1637)

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