# Multiple Angle Formula Help

• Dec 30th 2009, 08:02 AM
whiteforlife
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.

http://i49.tinypic.com/2n9kiz9.png
• Dec 30th 2009, 08:12 AM
VonNemo19
Quote:

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.

http://i49.tinypic.com/2n9kiz9.png

Start with number ione, and then work your way to the end. :)

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

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.
• Dec 30th 2009, 08:22 AM
whiteforlife
Quote:

Originally Posted by VonNemo19
Start with number ione, and then work your way to the end. :)

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

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?
• Dec 30th 2009, 08:25 AM
VonNemo19
Quote:

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
• Dec 30th 2009, 08:26 AM
skeeter
Quote:

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
• Dec 30th 2009, 09:07 AM
whiteforlife
Thanks guys that helped alot, I have it all figured out now.