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OpenStudy (anonymous):
Help please?! Given: sinA=-3/5, cosB=15/17, angle A in Quadrant III and angle B in Quadrant I. cos2B = a. -64/289 b. 161/289 c. 225/289 d. 240/289
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OpenStudy (goformit100):
b. 161/289
OpenStudy (anonymous):
THANK YOU SO MUCH! How do you fnd that answer?
OpenStudy (goformit100):
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