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Find the intervals where function is inc...

Find the intervals where function is increasing function y = cos x + sin x,x `epsilon[0,2pi]`

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The correct Answer is:
is increasing in `[0,pi/4]uu[(5pi)/(4),2pi]` as f.(x) is positive and decreasing in `[(pi)/(4),(5pi)/(4)]` as f.(x) is negative.
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