1^ + 2^ + 3^ + ..... + 180^ = - Vidyadip

MCQ

$\cos 1^\circ + \cos 2^\circ + \cos 3^\circ + ..... + \cos 180^\circ = $

A
$0$
B
$1$
✓
$-1$
D
$2$

✓

Answer

Correct option: C.

$-1$

c
$(\cos 1^\circ + \cos 179^\circ ) + (\cos 2^\circ + \cos 178^\circ ) + ....$

$ + (\cos 89^\circ + \cos 91^\circ ) + \cos 90^\circ + \cos 180^\circ = - 1$.

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