Write the expression as the sine or cosine of an angle.

Question

sin π/5 cos π/2 + sin π/2 cos π/5 =

 

? ?π/?

Answer 1

This looks like the addition angle identity angle of a sine function.

 

sin(π/2 + π/5) =

 

sin(5π/10 + 2π/10) =

 

sin(7π/10)