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Math Help - Differentiation

  1. #1
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    Differentiation

    Rules of differentiation to find the derivative of the function.
    pie/2 sin x - cos x
    Not sure what to use here.
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  2. #2
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    Quote Originally Posted by Nightasylum View Post
    Rules of differentiation to find the derivative of the function.
    pie/2 sin x - cos x
    Not sure what to use here.
    Im getting the answer to be pie/2 cos x + sin x but idk if thats right because what if i just change the sin x to cos x wouldnt they cancel, im so confused.
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  3. #3
    Super Member Matt Westwood's Avatar
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    You're thinking that:
    \frac d {dx}\left({\frac {\pi} 2 \sin x - \cos x}\right) = \frac {\pi} 2 \cos x + \sin x?

    Well, you're right.

    Diff of sine is cos, diff of cos is -sine, diff of a constant times a function is the constant times the diff of the function. Good job.
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  4. #4
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    Quote Originally Posted by Matt Westwood View Post
    You're thinking that:
    \frac d {dx}\left({\frac {\pi} 2 \sin x - \cos x}\right) = \frac {\pi} 2 \cos x + \sin x?

    Well, you're right.

    Diff of sine is cos, diff of cos is -sine, diff of a constant times a function is the constant times the diff of the function. Good job.

    Ok great can you help me with 1 more.
    6 square root of X+5 Cos X
    so I think I can change the form to X ^(1/6) + 5 -sin X Help ??? haha
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