Question

find cos(13π/6)

Answer 1

same as
\[\cos(\frac{\pi}{6})=\frac{\sqrt{3}}{2}\]

Answer 2

because cosine is periodic with period
\[2\pi\]

Answer 3

are they all periodic with 2π?

Answer 4

so would the answer be √3/2 * 13 which = 13√3/2?

Answer 5

oh wait never mind I get it! I don't have to multiply it for the times it goes around the circle