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Mathematics 17 Online
OpenStudy (anonymous):

if cosx=2/3 and x is in quadrant 4, then sin(x/2)= A.square root(1/6) B.1/3 C.-1/3 D.-square root(1/6)

OpenStudy (anonymous):

i know that sin is negative in the 4th quadrant

OpenStudy (anonymous):

answer is a

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