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Application of Derivatives
RS Aggarwal
CBSE
Grade 12

Question:

Find the intervals in which $f(x) = \sin x + \cos x, 0 \le x \le 2\pi$ is strictly increasing or decreasing.

Step-by-Step Solution

Key Concept: f' = cos x - sin x. Increasing on [0, \pi/4) U (5\pi/4, 2\pi], decreasing on (\pi/4, 5\pi/4).
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Correct Answer:
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