pre calc
posted by kate .
express the followinf trig functions in terms of an acute angle.
(a) cos 143 degrees
(b) tan 192 degrees

I do these with the following steps:
cos 143
 which quadrant is it in?  2nd
 by CAST rule, what sign is the cosine in the 2nd?  negative
 how far from 143º to the xaxis ?  37
so cos 143 =  cos 37
do the other one the same way.