Question

Which number is the period? Been a long time since I did this.. http://prntscr.com/47nal3

Answer 1

@SolomonZelman

Answer 2

match up x/2 with \( \frac{2 \pi}{T} x \)
the T is the period

Answer 3

So 4π?

Answer 4

we set ½ = 2pi/T
T= 4 pi

yes

Answer 5

thanks, @phi !