^ -1 [ (2 ^ -1 ( 2-1))]= ______. 1. 2-1 2. 1+ 2 3. 4 4. 3 4 - Vidyadip

Question

$\cos^{-1}[\cos(2\cot^{-1}(\sqrt2-1))]=$ ______.

$\sqrt2-1$
$1+\sqrt2$
$\frac{\pi}{4}$
$\frac{3\pi}{4}$

✓

Answer

$\frac{3\pi}{4}$

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