$\sin 20^{\circ}+\cos 20^{\circ}$ এর মান কত ?

$\sqrt{2} \cos 25^{\circ}$

$\sqrt{2} \sin 25^{\circ}$

$\frac{1}{\sqrt{2}} \sin 25^{\circ}$

$\frac{1}{\sqrt{2}} \cos 25^{\circ}$