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Math Help - chain rule help

  1. #1
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    chain rule help

    How do i use the chain rule to show that

    d/dx (sin(x)) = (pi/180)*cos(x)

    x is measured in degrees.

    Any help appreciated!
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  2. #2
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    Quote Originally Posted by amma0913 View Post
    How do i use the chain rule to show that

    d/dx (sin(x)) = (pi/180)*cos(x)

    x is measured in degrees.

    Any help appreciated!

    Well, as \pi rad.=180 degrees , using d to denote degree we get that d = \frac{\pi}{180}rad., so \sin{x deg.}=\sin{\frac{\pi}{180}x rad}
    Take it from now rememebring that \frac{d\sin{x}}{dx}=\cos{x} WHEN X is measured in radians!

    Tonio
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