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Mathematics 11 Online
OpenStudy (anonymous):

without evaluating express each number as the trigonometric ratio of an acute angle.

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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