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At what points in the interval [0, 2pi],...

At what points in the interval `[0, 2pi]`, does the function `sin (2x)` attain its maximum value ?

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The correct Answer is:
`x=(pi)/(4)` and `(5pi)/(4)`
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KUMAR PRAKASHAN-APPLICATION OF DERIVATIVES -EXERCISE - 6.5
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  4. What is the maximum value of the function sin x + cos x ?

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  7. Find the maximum and minimum values of x+sin(2x) on [0, 2pi].

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