Trig Distributive Problem - # 2

[Jason76]

\(\displaystyle (\dfrac{\pi }{8})[[4 \cos (0) + [4 \cos \dfrac{\pi }{8}] + [4 \cos \dfrac{\pi }{4}] + [4 \cos \dfrac{3\pi }{8}]]\) What does this come out to?

My attempt

\(\displaystyle (\dfrac{\pi }{8})[[4 (1) + [4 (.92387953251)] + [4 (.707106781)] + [4(.38268343236)]]\)

 

[stapel]

\(\displaystyle (\dfrac{\pi }{8})[[4 \cos (0) + [4 \cos \dfrac{\pi }{8}] + [4 \cos \dfrac{\pi }{4}] + [4 \cos \dfrac{3\pi }{8}]]\) What does this come out to?

What do you mean by "come out to"?

What generated this expression? What are you supposed to be doing with it?