Posted by Untamed on Monday, October 24, 2011 at 10:58pm.
Find the exact values of the following.
cos 270 degrees = 90 degrees, value = 0.
Sin 180 degrees = 18090 = 90 = 1, but its supposed to be zero, don't know how to get that:\
Confused with tan 240 degrees as well.

Calculus  Reiny, Monday, October 24, 2011 at 11:17pm
for the first two, like I told you in the last post, look at the graphs
for tan 240°
1. where is the angle ? in III , so the answer is 
2. how far to the xaxis? 60°
so tan240° = tan60° = √3/1 , (from the 3060 90 triangle ratio)
always check with your calculator