CosecA (1-cosA) (CosecA+ CotA)
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CosecA = ( 1 - cosA ) ( CosecA + CotA )
LHS = 1/sinA(1-cosA)*(1/sinA+cosA /sinA)
=(1/sinA-cosA/sinA)*(1+cosA)/sinA
=(1-cosA)/sinA*(1+cosA)/sinA
=1-(cos A*cosA)/(sinA*sinA)
=(sinA*sinA)/(sinA*sinA)
RHS = 1
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