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14 October, 05:02

Examine the function cos (x) on what interval is the derivative positive?

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  1. 14 October, 07:45
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    D/dx [cos (x) ]

    = - sin (x)

    So, what you're looking for is when

    -sin (x) > 0

    sin (x) < 0

    pi < x < 2pi

    or more accurately,

    kpi < (k+1) pi, where k is an odd integer.
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