# Thread: Multiple Angle Formula Help

1. ## Multiple Angle Formula Help

I have started a new chapter and I am having problems solving #6. I'm not even sure what I should do to start. Any help would be greatly appreciated.

2. Originally Posted by whiteforlife
I have started a new chapter and I am having problems solving #6. I'm not even sure what I should do to start. Any help would be greatly appreciated.

Recall that $\displaystyle \sin\theta=\frac{opposite}{hypotenuse}$

Well, you have the opposite, but not the hypotenuse. To find the hypotenuse, use the pythagorean theorem.

After you have computed sin, cos, and tan... You can make use of double angle Identities to find the values of the others.

3. Originally Posted by VonNemo19

Recall that $\displaystyle \sin\theta=\frac{opposite}{hypotenuse}$

Well, you have the opposite, but not the hypotenuse. To find the hypotenuse, use the pythagorean theorem.

After you have computed sin, cos, and tan... You can make use of double angle Identities to find the values of the others.
I was able to solve 1 & 2 but I do not recall Double Angle Identities. Want to steer me in the right direction?

4. Originally Posted by whiteforlife
I was able to solve 1 & 2 but I do not recall Double Angle Identities. Want to steer me in the right direction?
Check this out

Double-Angle and Half-Angle Formulas

5. Originally Posted by whiteforlife
I was able to solve 1 & 2 but I do not recall Double Angle Identities. Want to steer me in the right direction?
Double-Angle and Half-Angle Formulas

6. Thanks guys that helped alot, I have it all figured out now.