write the value of..............
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cot^2 theta = cos^2theta/sin^2 theta
cot^2 theta - 1/sin^2 theta = (cos^2 theta -1)/sin^2 theta
AS cos^2 theta -1 = - sin^2 theta
so - sin^2 theta/sin^2 theta = -1
cot^2 theta - 1/sin^2 theta = (cos^2 theta -1)/sin^2 theta
AS cos^2 theta -1 = - sin^2 theta
so - sin^2 theta/sin^2 theta = -1
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