Asked by kate
express the followinf trig functions in terms of an acute angle.
(a) cos 143 degrees
(b) tan 192 degrees
(a) cos 143 degrees
(b) tan 192 degrees
Answers
Answered by
Reiny
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 x-axis ? --- 37
so cos 143 = - cos 37
do the other one the same way.
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 x-axis ? --- 37
so cos 143 = - cos 37
do the other one the same way.
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