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Which of the following functions is peri...

Which of the following functions is periodic
(a) `cos^2x+sinx^3+"tan"(x^4)`
(b) `cos^2x+sinx^3+tan^4x`
(c) `cos^2x^2+sinx^3+tan^4x`
(d) `cos2x+sin3x+tan4x`

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