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Definition of radian: Radians are an angular measurement. One radian is the measure of a central angle of a circle that is subtended by an arc whose length is equal to the radius of the circle. ... Find each of the following numbers: If sin A = , 0 < A < and cos B = , 7) sin (A + B) 8) cos (A – B) 9) tan (A + B ) Algebra 3 Trig Formulas ... ................
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