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Math Help - 2nd derrivative of y=coskt

  1. #1
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    2nd derrivative of y=coskt

    Am i doing this right?

    y' = -sinkt
    y'' = -coskt

    ??

    thanks.
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by johntuan View Post
    Am i doing this right?

    y' = -sinkt
    y'' = -coskt

    ??

    thanks.
    Close...you forgot to apply the chain rule!!

    Do these again, and then check the spoiler to see if you're right.

    Spoiler:

    y^{\prime}=-k\sin kt

    y^{\prime\prime}=-k^2\cos kt
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  3. #3
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    ahhh...I can't believe I forgot to do such a function..

    Thanks for the reply!
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