If f(x) = ^2x and the composite function g(f(x)) = | |, then g(x)… - Vidyadip

MCQ

If $f(x) = \sin^2x$ and the composite function $\text{g(f(x))} = |\sin\text{x}|,$ then $g(x)$ is equal to:

A
$\sqrt{{x}-1}$
✓
$\sqrt{{x}}$
C
$\sqrt{{x}+1}$
D
$-\sqrt{{x}}$

✓

Answer

Correct option: B.

$\sqrt{{x}}$

Given that $\text{f(x)}=\sin^2\text{x}$ and the composite function $\text{g(f(x))}=|\sin {x}|$
We will do it using trial and error method.
If we take $\text{g(x)}=-\sqrt{{x}}$ and $\text{f(x)}=\sin^2{x}$
$\text{g(f(x))}=\text{g}(\sin^2{x})$
$=-\sin {x}$
Which contradicts to the $\text{g(f(x))}=|\sin {x}|$
Hence, we take $\text{g(x)}=\sqrt{{x}}$
$\text{g(f(x))}=\text{g}(\sin^2 {x})$
$=\sqrt{\sin^2{x}}=|\sin {x}|$

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