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Math Help - identity

  1. #1
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    identity

    ((sin x)^2 - (cos x)^2) / (sin x- cos x) = sin x + cos x

    I want to change the LHS only.
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  2. #2
    Super Member Failure's Avatar
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    Quote Originally Posted by Stuck Man View Post
    ((sin x)^2 - (cos x)^2) / (sin x- cos x) = sin x + cos x

    I want to change the LHS only.
    Remember a^2-b^2=(a+b)(a-b)? If so, apply that to the LHS, then cancel the common factor a-b of numerator and denominator.
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