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Thread: show how the derivative reduces...

  1. October 26th 2009, 06:40 AM #1
    JessicaWade
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    show how the derivative reduces...

    Show the derivative of y = sinh^(-1)x = ln(x + squareroot(x^2+1) reduces to ((1)/(squareroot(x^2 + 1))
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  2. October 26th 2009, 06:53 AM #2
    Chris L T521
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    Quote Originally Posted by JessicaWade View Post
    Show the derivative of y = sinh^(-1)x = ln(x + squareroot(x^2+1) reduces to ((1)/(squareroot(x^2 + 1))
    \begin{aligned}y^{\prime}&=\frac{1}{x+\sqrt{x^2+1} }\cdot\left(1+x\left(x^2+1\right)^{-1/2}\right)\\ &=\frac{x+\sqrt{x^2+1}}{\sqrt{x^2+1}\left(x+\sqrt{ x^2+1}\right)}\\ &=\frac{1}{\sqrt{x^2+1}}\end{aligned}

    Does this make sense?
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