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- Given cos(x)=-1/12 with 180°<x<270°. Find cos(x/2) - Given sin(x)= (squareroot 5)/3 where x is an...

- Given cos(x)=-1/12 with 180°<x<270°. Find cos(x/2)

- Given sin(x)= (squareroot 5)/3 where x is an acute angle. Find sin(x/2)

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