If $f(x) = |\cos x|$, then $f\left(\frac{3\pi}{4}\right)$ is:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → $\frac{1}{\sqrt{2}}$ ##
$f(x) = |\cos x|$
$f\left(\frac{3\pi}{4}\right) = \left|\cos \frac{3\pi}{4}\right| = \left|-\frac{1}{\sqrt{2}}\right| = \frac{1}{\sqrt{2}}$