((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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Originally Posted by Stuck Man ((sin x)^2 - (cos x)^2) / (sin x- cos x) = sin x + cos x I want to change the LHS only. Remember $\displaystyle a^2-b^2=(a+b)(a-b)$? If so, apply that to the LHS, then cancel the common factor $\displaystyle a-b$ of numerator and denominator.
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