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Math Help - Instantaneous Velocity

  1. #1
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    Instantaneous Velocity

    Find the instantaneous velocity of sin(2x) at x=1.

    I tried applying the definition of derivative at a point and then using trig identities (double angle, sum), but what I ended up, zero, with didn't make sense. How should this be calculated?

    Thanks
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  2. #2
    MHF Contributor Also sprach Zarathustra's Avatar
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    f'(x)=m=2cos(2x)

    f'(1)=2cos2
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  3. #3
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    Instructor wants me to use the definition of derivative at a point, not a derivative formula.
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  4. #4
    MHF Contributor Also sprach Zarathustra's Avatar
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    Quote Originally Posted by cribby View Post
    Instructor wants me to use the definition of derivative at a point, not a derivative formula.
    Derivative of sin x - An approach to calculus
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  5. #5
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    Quote Originally Posted by cribby View Post
    Find the instantaneous velocity of sin(2x) at x=1.

    [snip]
    That makes no sense. Go back and check the question. Is it meant to be x = sin(2t)?
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