The period of the function $f(\theta)=\sin \frac{\theta}{3}+\cos \frac{\theta}{2}$ is

The period of the function $f(\theta)=\sin \frac{\theta}{3}+\cos \frac{\theta}{2}$ is
  1. $3 \pi$
  2. $6 \pi$
  3. $9 \pi$
  4. $12 \pi$

Solution

We have, $f(\theta)=\sin \frac{\theta}{3}+\cos \frac{\theta}{2}$ LCM of 3 and 2 is 6 $\Rightarrow \quad \frac{\theta}{6}=2 \pi \Rightarrow \theta=12 \pi$ $\therefore$ Period is $12 \pi$

Asked in: AP EAMCET 2003

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