Hi, I'm obviously missing something here as I am only getting further awway from the answer. show that d/dx (cos x + sin x/ cos x - sin x) = sec^2(pi/4 +x) Thanks in advance
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Originally Posted by slaypullingcat Hi, I'm obviously missing something here as I am only getting further awway from the answer. show that d/dx (cos x + sin x/ cos x - sin x) = sec^2(pi/4 +x) Thanks in advance let's do something with the secant mess first ... now take the derivative of the left side and see if it matches up.
thank you very much, that was really easy to follow.
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