1. ## Trigonometric Identites

I need some help on 15 identites problems to help me study for my math final.

they range from problems like

sec^2x csc^2x = sec^2x + csc^2x

to

tan(pi/5) - tan(pi/30) = (-1/root 3)
1+tan(pi/5) tan(pi/30)

Anyone think they would be able to help me?

3. my final is on thursday. and anything anyone could really do would be great. whether it be do the problems out, or help me figure out how to start it.

4. ahh, so you want us to solve the problems you gave above..

so, i think, the first one is easy.. note that $\sec^2 x = tan^2x + 1$ and $\tan^2 x = \frac{\sin^2x}{\cos^2} =\frac{\sec^2x}{\csc^2x}$, so ithink, you can do it..

5. for the other one, take note of sum/difference in tangents.

$\tan (A \pm B) = \frac{\tan A \pm \tan b}{1 \mp \tan A \tan B}$

so can you recognize that $A = \frac{\pi}{5}$ and $B = \frac{\pi}{30}$?

6. They are blurry and somewhat hard to read, but if anyone wants to take a crack at some of them they are here:

http://img407.imageshack.us/img407/5696/math1lh2.jpg

http://img509.imageshack.us/img509/9642/math2fw6.jpg

http://img70.imageshack.us/img70/7996/math3hn7.jpg

http://img69.imageshack.us/img69/7543/dsc00180on3.jpg

15 problems. If anyone can't read something just let me know.