Homework Help: trig

Posted by Help pleaseee on Friday, October 7, 2011 at 9:32pm.

I have to factor the expression and use fundamental identities:

sins^2xcscx^2-sin^2x

sec^4x-tan^4x

trig - Reiny, Saturday, October 8, 2011 at 12:20am
sins^2xcscx^2-sin^2x
= sin^2x(csc^2x - 1)
= sin^2x(cot^2x)
= sin^2x(cos^2x/sin^2x)
= cos^2x

sec^4x - tan^4x
= (sec^2x - tan^2x)(sec^2x + tan^2x)
= (tan^2x + 1 - tan^2x)(tan^2x + 1 + tan^2x)
= 1(2tan^2x +1)
= 2tan^2x + 1
trig - Anonymous, Saturday, October 8, 2011 at 8:03pm
OHHH okay, THANKS!

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