Question:
$f(x)=\sin 2 x+5$ on $R$
Solution:
Given: $f(x)=\sin 2 x+5$
We know that $-1 \leq \sin 2 x \leq 1$
$\Rightarrow-1+5 \leq \sin 2 x+5 \leq 1+5$
$\Rightarrow 4 \leq \sin 2 x+5 \leq 6$
$\Rightarrow 4 \leq f(x) \leq 6$
Hence, the maximum and minimum values of $f$ are 6 and 4 , respectively.
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