|
Tutors Answer Your Questions about Trigonometry-basics (FREE)
Question 198281: I am having a very hard time will sin and cos problems. Here is one that I can't solve:  .I don't even know how to start because I haven't had any training in cos and sin problems yet. I just know that this problem will have four answers. If you have any advice on the cos and sin problems I would love to hear it. Thank you!
Click here to see answer by RAY100(1637)   |
Question 198326: PROBLEM:
The Vang family has a backyard with the dimensions of 35ft, 75ft, 90ft. They want to plant small trees that require 9 square feet of surface area each. How many should they plant? Round your answer to the nearest whole tree.
Click here to see answer by checkley77(7056) |
Question 198230: OK..well, im working on a lesson of where I am learning how to graph sin, and cos by finding the amplitude, period, x-intercepts, and phase shift. can you help me undersrtand what they mean by graphing it because i don't really know how to...example: y= -3cos(x+pi/4)
Click here to see answer by Alan3354(6088)  |
Question 195591: A soccer ball is kicked straight up with an initial velocity of 32 ft. per second. Its height above the earth is given by s (t) = -16t2 + 32t, where,‘s’ is the height in ft. at any time, ‘t’ seconds.
a What is the maximum height reached by the ball?
b How long after it was thrown up the ball reaches its maximum height?
Click here to see answer by arallie(162) |
Question 198573: Find an equation of the line that bisects the obtuse angles formed by the lines with equations 3x-y=1 and x+y=-2.
a. (3√2 +√10)x-(√10 + √2)y-2√10+√2=0
b. (3√2 - √10)x+(√10 - √2)y+2√10+√2=0
c. (3√2 + √10)x+(√10 - √2)y+2√10 - √2=0
d. (3√2 + √10)x-(√10 + √2)y-2√10-√2=0
Work:
3x-y=1 ==> y= 3x-1; m = 3
and x+y= -2 ==> y = -x -2; m = -1
an equation of the line that bisects the obtuse angles
has slope m = 1 because (3+-1)/2
Find the intersection point:
3x-1 = -x-2
4x=-1
x = -1/4; y = 1/4-2= -7/4
Equation:
y - -7/4 = 1( x- -1/4)
y+ 7/4 = x + 1/4
y = x -3/2
not sure which one it is
Click here to see answer by solver91311(5072)  |
Question 198688: Hello! My name is Aeriin yanu and I am having troubles with proving trigonometric identity. I just learned the lesson today and I don't really understand the lesson. Can you show me how you can solve a trigonometric identity?
ex:
sin square root of 2 phata+ sin square root of 2 phata cotangentsquare root of 2 phata= 1
Click here to see answer by jim_thompson5910(13794) |
Question 198725: I have a right triangle. |> (just like that, the 90 degree angle is in the lower left, and the hypotenuse runs diagonally from top to bottom on the right side). The left leg measures 4x, and the bottom leg measures x. I have to find the hypotenuse. I was able to find the angles using trigonometry. The upper left angle measures 14. The lower right angle measures 76. The lower left angle measures 90. I did all the work I can think of, but I still can't find the hypotenuse. Please help!
Click here to see answer by Alan3354(6088) |
Question 198700: I need help to rewrite each expression in terms of cos phata. Then simplify.
1. 2sin phata cos phata cot phata.
2. 1 + cot phata divided by cot phata ( sin phata+ cos phata)
3. cos square root of 4 phata - sin square root of 4 phata + sin squareroot of 2 phata.
Click here to see answer by Edwin McCravy(2922) |
Question 200293This question is from textbook Geometry
: This is about vectors, tangent,and direction.
Can someone show me the steps to using tangent to find the directions?
Heres a problem, and the book i have skips some steps(assuming you can figure the steps out on your own, i guess)
1) A pilot flys due north at 250 miles per hour. If the wind is blowing due east at 20 mph what is the direction of the plane?
(Heres what they show for how to get the answer)
tan0=20/250
0=tan^-1(20/250)
0=4.6
They only show three steps and i dont know how they go from 0=^tan-1(20/250) to 0=4.6?????
because 20/250=.08 and so if you tan^-1 (.08) you get about .079, which isnt close to 4.6
Please explain to me what they do to get a tan^-1(20/250) to 4.6
This question is from textbook Geometry
Click here to see answer by jim_thompson5910(13794) |
Question 200375: All angles are in radians and I have to choose which of the following 2 statements are true:
The y-intercept of the graph of y = sin x is 1
The y-intercept of the graph of y = tan x is 1
I have looked through all paperwork I have and can't find a direct source for this. I have also created the graphs on a graphic calculator but can only see that the y-intercept for both is 0, I'm obviously doing something wrong.
Thank you in advance for your help
Click here to see answer by Alan3354(6088) |
Question 200557This question is from textbook Trigonometry
: Hi,
I'm not sure if I'm doing this right, here's the question in its entirety:
The 8-in(diameter) Howitzer on the U.S. Army's M110 can propel a projectile a distance of 18,500yd. If the angle of elevation of the barrel is 45 degrees, then what muzzle velocity (in feet per second) is required to achieve this distance?
I'm using the formula: Vo2 sin 2(theta) = 32(distance). I've converted the 18,500yd to 55,500 feet. I don't see a use for the 8-in diameter value.
step 1: Vo2 sin(90) = 32(55,5000
step 2: Vo2 * 1 = 1,776,000
step 3: Vo2 = 1,776,000
step 4: Vo = 1,333 feet/sec
I don't know if I'm using the formula correctly or not. Any help would be gratefully received.
Thanking you in advance, LynnThis question is from textbook Trigonometry
Click here to see answer by Alan3354(6088) |
Question 201357: I'm taking a practice test for the SAT II Subject Test in Math Level IC and there are all these questions about adding and subtracting sin, cos, tan, cos, sec, and cot which I have never learned. (I've taken Algebra I, Geometry, and Algebra II).
I know we're not supposed to ask about more than one problem in one question, but... here are the questions that I have no idea how to solve:
19. -cos^2 θ - 9sin^2 θ =
A. 0 B. 1 C. -1 D. 9 E. -9
34. If tan 10° = cot θ, then θ =
A. 10° B. 80° C. 70° D. -10° E. 90°
and
36. If cos (45+2x)° = sin (3x)°, then x=
A. 18° B. 27° C. 45° D. 22.5° E. 9°
Thanks for any help, even if you just help me with one of them!
Click here to see answer by jsmallt9(594) |
|
Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790
|
| |
