By writing cos hx - 1 2 e x - e -x - prove that d dx cos hx -sin hx

coshx = e^x + e^ x2 now, d(e^x+e^ x2)dx = e^x e^ x2 e^x e^ x2 = sinhx hence, #160; d(coshx)dx = sinhx ...

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Question

By writing $cos h x = \frac{1}{2} (e^{x} + e^{- x})$ , prove that
$\frac{d}{d x} (cos h x) = sin h x$

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