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Math Help - Derivative PROOFS

  1. #1
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    Derivative PROOFS

    prove that d/dx (cscx) = -cscxcotx

    how do i prove this?
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: Derivative PROOFS

    I would begin with:

    \frac{d}{dx}(f(x))\equiv\lim_{h\to0}\frac{f(x+h)-f(x)}{h}
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  3. #3
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    Re: Derivative PROOFS

    \csc{x} = (\sin{x})^{-1}

    use the chain rule ...

    or

    \csc{x} = \frac{1}{\sin{x}}

    use the quotient rule ...
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