Question
The period of the function $f(x)=\sin ^{4} x+\cos ^{4} x$ is :(A) $\pi$(B) $\frac{\pi}{2}$(C) $2 \pi$(D) None of these
Step 1
We can rewrite this function as $f(x)=(\sin ^{2} x)^{2}+(\cos ^{2} x)^{2}$. Show more…
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