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Which of the following functions is not ...

Which of the following functions is not periodie? (a) `|sin3x|+sin^2x` (b)`cossqrt(x)+cos^2x` (c) `cos4x+tan^2x` (d) `cos2x+sinx`

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The correct Answer is:
b
(b) Since `cos sqrt(x)` is not periodic, `cos sqrt(x)+cos^(2)x` is not periodic though `cos^(2)x` is periodic. Though `cos^(2)x` is periodic.
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