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Math Help - Differentiate

  1. #1
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    Differentiate

    I don't understand the attached question. There might be a misprint.
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  2. #2
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    e^(i*pi)'s Avatar
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    f(x) = 6 \sin (x) + \sqrt{2} \cos (x)

    f'(x) = 6 \cos (x) - \sqrt{2} \sin (x)

    f''(x) = -6 \sin (x) - \sqrt{2} \cos (x) = -[6 \sin (x) + \sqrt{2} \cos (x)] = -f(x)
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  3. #3
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    Thanks, I can see now its a standard notation for the second derivative.
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