# Trigonometry

verify the identity:

1- (cos^2x)/(1-sinx)= -sinx

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asked by Sean
1. I already did this today, scroll down

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posted by Damon
2. verify the identity:

1-cos^2x/1-sinx= -sinx

Trigonometry - Damon, Monday, May 30, 2011 at 6:43pm

assume you mean (this took some serious detective work - please be careful with parentheses)

1- (cos^2x)/(1-sinx)= -sinx
cos^2x = 1 - sin^2 x
so we have
1 - (1-sin x)(1+sin x)/(1-sin x) = -sin x

1 - (1+sin x) = -sin x

1 - 1 - sin x = -sin x

-sin x = -sin x

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posted by Damon

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