Please help me I don't knoe
2 answers:
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Coefficients, constant doesn't matter in period. only the "argument" or parameters or the angle matters.
if has a period $T$ then $cf(ax+b)+d$ will have period of $\frac Ta$ (nothing matters other than that), $T$ is the fundamental period.
$\sin(x)$ has fundamental period is $2\pi$ so period of $fx)$ will be $\pi$