(sinA/1-cosA-1-cosA/sinA). (cosA/1-sinA-1-sinA/cosA)=4
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LHS = [sinA/(1 - cosA) - (1 - cosA)/sinA].[cosA/(1 - sinA) - (1 - sinA)/cosA ]
= [{sin²A - (1 - cosA)²}/(1 - cosA)sinA].[{cos²A - (1 - sinA)²}/(1 - sinA)cosA]
= [{sin²A - 1 - cos²A + 2cosA}/(1 - cosA)sinA].[{cos²A - 1 - sin²A + 2sinA}/(1 - sinA)cosA ]
= [{-(1 - sin²A) - cos²A + 2cosA}/(1 - cosA).sinA].[{-(1 - cos²A) - sin²A + 2sinA}/(1 - sinA)cosA]
= [{-2cos²A + 2cosA}/(1 - cosA)sinA]. [{-2sin²A + 2sinA}/(1 - sinA)cosA]
= [2cosA(1 - cosA)/(1 - cosA)sinA]. [2sin(1 - sinA)/(1 - sinA)cosA]
= [2cotA].[2tanA]
= 4[tanA.cotA]
= 4 = RHS
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