Question

The value of $\cos 1^{\circ }$.cos$2^{\circ }.\cos$3$........cos$180 is equal to:

• A. 1
• B. 0
• C. -1
• D. $\frac{1}{2}$

Answer 1

Answer: (B)

0

Since $\cos {90}^0=0$, hence, the product of $\cos 1^0\cos 2^0\cos 3^0....\cos {180}^0=0$