SOLUTION: Evaluate without using a calculator by using ratios in a reference triangle.
(a) cos 120 degrees
(b) tan 300 degrees
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-> SOLUTION: Evaluate without using a calculator by using ratios in a reference triangle.
(a) cos 120 degrees
(b) tan 300 degrees
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Question 652615: Evaluate without using a calculator by using ratios in a reference triangle.
(a) cos 120 degrees
(b) tan 300 degrees Answer by lwsshak3(11628) (Show Source):
You can put this solution on YOUR website! Evaluate without using a calculator by using ratios in a reference triangle.
(a) cos 120 degrees
use reference angle of 60º in quadrant II where cos<0
cos 60º=-1/2
(b) tan 300 degrees
use reference angle of 60º in quadrant IV where tan<0
tan 60º=-√3
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