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  4. The number of solutions of | cos x|= sin x, 0 ≤ x ≤ 4 π is

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Q. The number of solutions of $|\cos x|=\sin x, 0 \leq x \leq 4 \pi$ is

Trigonometric Functions

Solution:

Draw the graphs of $y=|\cos x| \& y=\sin x$
image
Clearly both is curves intersect each other at $4$ point.