Test Academy | If f:R→R f(x)=cos⁡x and g(x)=7x3+6, then fοg(x) is cos⁡(7x³+6), cos⁡x, cos⁡(x³), cos(x³+6/7)

Question

If f:R→R f(x)=cos⁡x and g(x)=7x3+6, then fοg(x) is

Options :

cos⁡(7x³+6)
cos⁡x
cos⁡(x³)
cos(x³+6/7)

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