(1-cot - Cosec) (1 tan + sec) =2
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LHS =1+cotA−cosecA
=1+ sinA/cosA -1/sin A= (sinA+cosA−1)/sinA
1+tanA+secA=1+ sinA/cosA +1/cos A
= (sinA+cosA+1)/cosA
(1+cotA−cosecA)(1+tanA+secA)
= (sinA+cosA−1)(sinA+cosA+1)/sinA cosA
=(sinA+cosA)^2−1/sinA cosA
= 1+2sinAcosA−1/sinA cosA
=2=RHS
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