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    Gernald's Avatar
    Gernald Posts: 901, Reputation: 93
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    #1

    Feb 19, 2009, 10:52 AM
    differentiating w/ cos, and sin
    I'm trying to figure out how to differentiate cos(pi x)/(sin(pi x)+cos(pi x)) and am so confused! Do I combine the chain rule with the quotient rule, and onc I get there how do I simplify? Right now I have an equation that's bigger than the width of the paper.

    Thanks for any help!
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    Feb 19, 2009, 02:45 PM

    The derivative of sin(x) (with respect to x) is cos(x)
    The derivative of cos(x) (with respect to x) is -sin(x)

    You need to combine the chain rule with the quotient rule.
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