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OpenStudy (anonymous):
sin(a)-cot(a)+cot(2a)=
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OpenStudy (anonymous):
sina-cosec2a
OpenStudy (anonymous):
sina-cota+cot2a=sina-(cosa/sina)+(cos2a/sin2a) =(2sin^2acosa-2cos^a+1-2sin^2a)/sin2a =(2sin^2acosa-2(cos^2a+sin^2a)+1)/sin2a =(2sin^2acosa-1)/sin2a =sina-(1/sin2a) =sina-cosec2a
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