I've got a picture of a unit circle with an angle theta and an angle alpha but the angles are not given. There are 2 points on the circle. Theta goes through the point (-0.985, -0.174) and alpha goes through the point (0.940, -0.342) I need to find the sine of theta and the cosine of alpha. I also n...

- on Sun Feb 22, 2009 11:15 pm
- Forum: Trigonometry
- Topic: find sin(theta), cos(alpha), theta, alpha from picture w/ pt
- Replies:
**2** - Views:
**4316**

- on Wed Feb 25, 2009 6:39 pm
- Forum: Trigonometry
- Topic: find sin(theta), cos(alpha), theta, alpha from picture w/ pt
- Replies:
**2** - Views:
**4316**

if the cos inverse of x= pie/3 what is the sin inverse of x ?

- on Wed Feb 25, 2009 6:42 pm
- Forum: Trigonometry
- Topic: if the cos inverse of x=pie/3 what is the sin inverse of x ?
- Replies:
**3** - Views:
**7480**

cos((pi)/3) = 1/2, so i'm just taking sin inverse of 1/2?

- on Wed Feb 25, 2009 11:22 pm
- Forum: Trigonometry
- Topic: if the cos inverse of x=pie/3 what is the sin inverse of x ?
- Replies:
**3** - Views:
**7480**

one side of triangelar lot has a length of 100 feet; the angle opposite that side is 55 degrees. another angle is 63 degrees. how much fence will be needed to enclose the lot? i am having trouble figuring out which angle goes where and if i should use Cos or Tan

- on Thu Feb 26, 2009 2:31 pm
- Forum: Trigonometry
- Topic: one side of a triangular log has a length of 100 feet
- Replies:
**4** - Views:
**3732**

i did 180-55-63=62 then 100/sin55=x/sin63=y/sin62 so x=108.8 y=107.8

is it ok that their about the same?

is it ok that their about the same?

- on Fri Feb 27, 2009 5:29 pm
- Forum: Trigonometry
- Topic: one side of a triangular log has a length of 100 feet
- Replies:
**4** - Views:
**3732**

- on Sat Feb 28, 2009 3:01 pm
- Forum: Trigonometry
- Topic: one side of a triangular log has a length of 100 feet
- Replies:
**4** - Views:
**3732**

"If tan(theta) = 1/2, find sin(theta) using trig identities."

I know how to do this with triangles: use pyth. thm to find the hypotenuse, and read off the answer. But what identity should I use?

I know how to do this with triangles: use pyth. thm to find the hypotenuse, and read off the answer. But what identity should I use?

- on Sun Mar 01, 2009 10:15 pm
- Forum: Trigonometry
- Topic: if tan(theta) = 1/2, find sin(theta) using trig identities
- Replies:
**4** - Views:
**26782**

1 = 1^3

8 = 2^3

27 = 3^3

64 = 4^3

1 = 1^2

9 = 3^2 (3 = 1 + 2)

36 = 6^2 (6 = 1 + 2 + 3)

100 = 10^2 (10 = 1 + 2 + 3 + 4)

8 = 2^3

27 = 3^3

64 = 4^3

1 = 1^2

9 = 3^2 (3 = 1 + 2)

36 = 6^2 (6 = 1 + 2 + 3)

100 = 10^2 (10 = 1 + 2 + 3 + 4)

- on Fri Mar 06, 2009 1:33 pm
- Forum: Discrete Math
- Topic: simplify the sums, add two more lines, make a conjecture
- Replies:
**3** - Views:
**2354**

- on Sat Mar 07, 2009 4:00 pm
- Forum: Discrete Math
- Topic: simplify the sums, add two more lines, make a conjecture
- Replies:
**3** - Views:
**2354**