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simplify and write the trigonometric equation in terms of sine and cosine.


  • trig -

    You have not provided an equation.

    Equations have an "=" sign.

    You must have left something out.

    Perhaps they just want you to write the term tan^2x-sec^2x in terms of sines and cosines. If so, they should have said so.

  • trig -

    from the main Pythagorean Identity we know

    tan^2 x + 1 = sec^2 x

    so tan^2x-sec^2x = tan^2 x - (tan^2 x + 1)
    = -1

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