Question

if B be the exterior angle of a regular polygon of n - sides and A is any constant then
COSA * cos(A + B) + cos(A + 2B) + ....... n terms is equal to
(1) 0
2) cosA
3)1
4)
$\sqrt{3} \div 2$
​

Answer 1

Answer:

4.5

Step-by-step explanation:

3 square equals to 9 dividededby 2 is 4.5