If f(x) = \cos x and g(x) = x^3 then (f \circ g)(x) is (i) (\cos x)^3

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Module 1: Sets, Relation and Function.

20232m

If $f(x) = \cos x$ and $g(x) = x^3$ then $(f \circ g)(x)$ is
(i) $(\cos x)^3$
(ii) $\cos 3x$
(iii) $x^{(\cos x)^3}$
(iv) $\cos x^3$

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