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differentiate y = sin^(-1)x

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  1. Offline

    i tried using chain rule, with u = sin x

    I get -cosx/sin x

    but answer is

  2. Offline

    You must not confuse sin^{-1}x as \frac{1}{\sin x}. The first means the inverse sin function not the recipricol.

    To differentiate the inverse sin function you do the following:

    little hint:

    \sin y = x and use implicit differentiation

    full working:

    \cos y \frac{dy}{dx} =1
    \frac{dy}{dx}=\frac{1}{cos y}
    But you know that  \sin^2y + \cos^2 y = 1
    therefore \cos y = \sqrt{1 - \sin^2y}
    and you also know that  sin^2y = x^2
    Unparseable or potentially dangerous latex formula. Error 4: no dvi output from LaTeX. It is likely that your formula contains syntax errors or worse.

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    sin y = x
    cos y = dx/dy
    dy/dx=1/cos y


    sin y=x
    (1-x^2)^1/2= cos y sub that into 1/cos y


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