trigonometry
posted by lovelady7 .
(a) If è is in standard position, then the reference angle è is the acute angle formed by the terminal side of è and the Select xaxis yaxis . So the reference angle for è = 120°
is è = ?°, and that for è = 210°is è = ? degrees.
(b) If è is any angle, the value of a trigonometric function of è is the same, except possibly for sign, as the value of the trigonometric function of
è. So sin(120°) = sin ?°, and sin(210°) = −sin ?°.

trigonometry 
Damon
the reference angle is to the X (or x) axis
for 120 it would be 180  120 = 60 degrees above x axis
cos 60 = 1/2
cos 120 = 1/2
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