1. ## trigonometric functions

evaluate all six trigonometric functions

$\displaystyle 19pi/4$ ( i know this is two rotations plus 5pi/4)
$\displaystyle 420 deg$ ( i know this is one rotation plus 5pi/3)

2. Originally Posted by Dragon
evaluate all six trigonometric functions

$\displaystyle 19pi/4$ ( i know this is two rotations plus 5pi/4) No, it isn't
$\displaystyle 420 deg$ ( i know this is one rotation plus 5pi/3) No, it isn't
You are going to have alot of trouble if you can't see why you are wrong there. Remember, one complete cycle is $\displaystyle 2\pi=360^\circ$