Simplify 1_cos theta ×1+cos theta ×1+cotsquare theta
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(1-cosQ)(1+cosQ)(1+cot^2Q)
=(1-cos^2Q)(1+cot^2Q)
=sin^2Q×cosec^2Q
sin^2Q/sin^2Q
=1
=(1-cos^2Q)(1+cot^2Q)
=sin^2Q×cosec^2Q
sin^2Q/sin^2Q
=1
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