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If lim(theta->0)((a(1-costheta))/(theta...

If `lim_(theta->0)((a(1-costheta))/(theta^2)-(bsintheta)/(theta))=1` then the value of `2b-a` is `-lambda` , then the value of `lambda` is
(1) 2
(2) 4
(3) 6
(4) 8

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