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trig

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simplify the expression.

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

  • trig -

    csc(-x) = -csc(x)

    sin^2+cos^2 = 1

  • trig -

    But my teacher gave the answer on the review as -1.

  • trig -

    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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