# If f(theta) = sin theta = 0.2 Find f(theta + pi)

If $f\left(\theta \right)=\mathrm{sin}\theta =0.2$
Find $f\left(\theta +\pi \right)$
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yunitsiL
$f\left(\theta \right)=\mathrm{sin}\theta$ has a period of $2\pi$ such that consecutive half-period values have the same absolute values but alternate in sign.
Since $f\left(\theta +\pi \right)$ means the value of $f\left(\theta \right)$ after a half-period, then we only take the opposite of its value:
$f\left(\theta +\pi \right)=-0.2$