Prove the differentiation formula. d dx Let y = sech(x), then, in exponential terms, y = 11 Taking the derivative, in exponential terms, gives the following. dy dx = -[sech(x)] = -sech(x) tanh(x) et X -2 = -sech(x) tanh(x) + e-x et ] ----) -e-x ex + ex

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