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

sins^2xcscx^2-sin^2x

sec^4x-tan^4x

- trig -
**Reiny**, Saturday, October 8, 2011 at 12:20amsins^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 8:03pmOHHH okay, THANKS!

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