10-3 babyy :)

So in 10-3 theres a bagillion(my new word) :D formulas!

1. sin2(alpha) = 2sin(alpha)cos(beta)

2. cos2(alpha) = cos^2(alpha)-sin^2(alpha)

3. cos2(alpha) = 1-2sin^2(alpha)

4. cos2(alpha) = 2cos^2(alpha)-1

5. tan2(alpha) = 2tan(alpha)/1-tan^2(alpha)

6.sin(alpha)/2 = +or- square root of 1-cos(alpha)/2

7. cos(alpha)/2 = +or- square root of 1+cos(alpha)/2

8. tan(alpha)/2 = +or- square root of 1-cos(alpha)/1+cos(alpha)

9. tan(alpha)/2 = sin(alpha)/1+cos(alpha)

10. tan(alpha)/2 = 1-cos(alpha)/sin(alpha)

Simplify.

Ex. 1.) cos 2 (x^2) = 2x^4-1