X=20
180-31-90
61=3x-1
60=3x
4
27. 1st you multiply 7×6 equals 42 ....carry 4
×6. over 2
2. 2nd you do 2×6 equals 12... add 4 +12
=162. <-------then you get this
The regular period is 2pi. If you look up or type in a graphing calculator you can see that's when the sine function starts to repeat itself.