State the exact value of cos5๐/3
cos(2ฯ-ฮธ) = cos(ฮธ) so
cos(5ฯ/3) = cos(ฯ/3) = 1/2
You can see this if you draw the angle, and then recall that
cos(ฮธ) = x/r
cos(5ฯ/3) = cos(ฯ/3) = 1/2
You can see this if you draw the angle, and then recall that
cos(ฮธ) = x/r