we cancel (cos x - sin x) in the numerator and denominator to get 1/(cos x) Why is it -1?
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$\displaystyle \cos(x)-\sin(x)=-(\sin(x)-\cos(x))$ Then after dividing out this factor, the -1 is left in the numerator.
Originally Posted by kingsolomonsgrave we cancel (cos x - sin x) in the numerator and denominator to get 1/(cos x) Why is it -1? Algebra Just factor a -1 out of the numerator $\displaystyle \frac{a-b}{b-a}=\frac{-1(b-a)}{(b-a)}=-1$
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