# The value of cos 1° cos 2° cos 3° ..... cos 180° is

Question:

The value of $\cos 1^{\circ} \cos 2^{\circ} \cos 3^{\circ}$ $\cos 180^{\circ}$ is

(a) 1

(b) 0

(c) $-1$

(d) None of these

Solution:

Here we have to find: $\cos 1^{\circ} \cos 2^{\circ} \cos 3^{\circ} \ldots \cos 180^{\circ}$

$\cos 1^{\circ} \cos 2^{\prime \prime} \cos 3^{\circ} \ldots \cos 180^{\prime \prime}$

$=0$

Hence the correct option is (b)