Question

Write the expression as a sine or cosine of angle sin pi/5 cos pi/2 + sin pi/2 cos pi/5

Answer 1

(cos(π) sin(π))/(2 5) + (cos(π) sin(π))/(5 2) = 1/5 cosh(i π) cos(-π/2)

Explanation:

Answer 2

sin 7π/10

Explanation: