The incorrect statement is
$\sin \theta = - \frac{1}{5}$
$\cos \theta = 1$
$\sec \theta = \frac{1}{2}$
$\tan \theta = 20$
$\cos 1^\circ .\cos 2^\circ .\cos 3^\circ .........\cos 179^\circ = $
Which of the following is correct
Find the value of the trigonometric function $\sin 765^{\circ}$
$\cos 1^\circ + \cos 2^\circ + \cos 3^\circ + ..... + \cos 180^\circ = $
Prove that:
$2 \sin ^{2} \frac{\pi}{6}+\cos ec ^{2} \frac{7 \pi}{6} \cos ^{2} \frac{\pi}{3}=\frac{3}{2}$