405^ =? - Vidyadip

MCQ

$\cos 405^{\circ}=?$

A
$\frac{-1}{\sqrt{2}}$
B
$-\sqrt{2}$
C
$\sqrt{2}$
D
$\frac{1}{\sqrt{2}}$

✓

Answer

(d)$\frac{1}{\sqrt{2}}$
Explanation: $\cos 405^{\circ}=\cos \left(360^{\circ}+45^{\circ}\right)=\cos 45^{\circ}=\frac{1}{\sqrt{2}}$

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