The range of values of lambda,lambda>0 such that the angle theta between the pair of tangents drawn from (lambda,0) to the circle x^2+y^2=4 lies in (pi/2,(2pi)/3) is Please explain why I am not getting the answer by the method in the photo ?

The range of values of lambda,lambda>0 such that the angle theta b

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The range of values of lambda,lambda>0 such that the angle theta between the pair of tangents drawn from (lambda,0) to the circle x^2+y^2=4 lies in (pi/2,(2pi)/3) is Please explain why I am not getting the answer by the method in the photo ?

The range of values of lambda,lambda>0 such that the angle theta between the pair of tangents drawn from (lambda,0) to the circle x^2+y^2=4 lies in (pi/2,(2pi)/3) is

Please explain why I am not getting the answer by the method in the photo ?

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