Cos theta= -12/15 and Quadrant 2 Find Sin 2 theta

Use double angle or half angle identity to find exact value of each expression. Please Help!!
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1 Answer

kosine(x)=-12/15 =-0.8

yuze invers kosine tu get x=143.1301024 deg

2x=286.2602047

sine(2x)=-0.96
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