derivative of ln(x+sqrt(x^2-1)), calculus 1 tutorial

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Derivative of ln(x+sqrt(x^2-1)), calculus 1 tutorial.

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h(x) = arcosh(x)
cosh(h(x)) = x
sinh(h(x))*h'(x) = 1
h'(x) = 1/sinh(h(x))
h'(x) = 1/sinh(arcosh(x))
h'(x) = 1/sqrt(cosh(arcosh(x))²-1)
h'(x) = 1/sqrt(x²-1)

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