If the solve the problem

Question:

$f(x)=|\sin 4 x+3|$ on $R$

Solution:

Given: $f(x)=|\sin 4 x+3|$

We know that $-1 \leq \sin 4 x \leq 1$.

$\Rightarrow 2 \leq \sin 4 x+3 \leq 4$

$\Rightarrow 2 \leq|\sin 4 x+3| \leq 4$

$\Rightarrow 2 \leq f(x) \leq 4$

Hence, the maximum and minimum values of $f$ are 4 and 2 , respectively.

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