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OpenStudy (anonymous):
without evaluating express each number as the trigonometric ratio of an acute angle.
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OpenStudy (anonymous):
sin130
OpenStudy (anonymous):
130 is a second quadrant angle...so sin 130 is positive In second quadrant, you do 180 - angle given so, sin 130 = sin 50
OpenStudy (anonymous):
50 degrees is the reference angle for 130 degree-angle.
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