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Math Help - Inverse trigonometric equation

  1. #1
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    Inverse trigonometric equation

    Where do I start with this:

    cos-1x + tan-1 x = π/2
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: Inverse trigonometric equation

    I would take the cosine of both sides. The right side becomes zero, and on the left side you may apply the angle-sum identity for cosine.
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