Question

cos$1^{\circ }$ $\times$ cos$2^{\circ }$ $\times$ cos$3^{\circ }$ $\times$……..$\times$ cos${180}^{\circ }$ is equal to:

• A. 1
• B. 0
• C.
• D. -1

Answer 1

The correct option is B

0

$cos{90}^{\circ }$ = 0,
$\therefore cos{1}^{\circ }$ $\times$ cos$2^{\circ }$ $\times$ cos$3^{\circ }$ $\times$……..$\times$ cos${180}^{\circ }$ is equal to: 0, since any number multiplied by 0 is 0.