Thursday

August 28, 2014

August 28, 2014

Posted by **Corin** on Sunday, May 20, 2007 at 9:05pm.

1. (cos^2y)/(1-siny)=1+siny

2. sin^2a-sin^4a=cos^2a-cos^4a

Thanks!

change cos^2a to 1-sin^2a=(1-sina)(1+sina)

Thank you. I figured out the first one with your help, but I'm still stuck on the second. Any tips?

**Related Questions**

TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...

Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...

math - find all solutions in the interval [0,2 pi) sin(x+(3.14/3) + sin(x- 3.14/...

tigonometry - expres the following as sums and differences of sines or cosines ...

Trig - Please help with this one. I've worked it out in so many ways and can't ...

trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...

Math - Calculus - The identity below is significant because it relates 3 ...

algebra - Can someone please help me do this problem? That would be great! ...

math - Prove that for all real values of a, b, t (theta): (a * cos t + b * sin t...

pre-cal - Simplify the given expression........? (2sin2x)(cos6x) sin 2x and cos ...