chloemandile4333 chloemandile4333

13-08-2017
Mathematics

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

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mrbriandizzleotypko mrbriandizzleotypko

13-08-2017

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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