Posted by **trig** on Sunday, July 14, 2013 at 10:37am.

simplify the expression.

cot^2(x)-csc^2(-x)

- trig -
**Steve**, Sunday, July 14, 2013 at 4:56pm
csc(-x) = -csc(x)

sin^2+cos^2 = 1

- trig -
**tony**, Sunday, July 14, 2013 at 5:17pm
But my teacher gave the answer on the review as -1.

- trig -
**Steve**, Monday, July 15, 2013 at 5:01am
but but but ... you should have used my hints.

csc^2(-x) = (-cscx)^2 = csc^2(x)

sin^2+cos^2 = 1

divide by sin^2 to get

1+cot^2 = csc^2

cot^2 - csc^2 = -1

sin^2+cos^2=1 will help solve many problems.

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