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Prove that: cotA/2-tanA/2=(cosA/2)/(si...

Prove that:
`cotA/2-tanA/2=(cosA/2)/(sinA/2)-(sinA/2)/(cosA/2)`
`=(cos^(2)A/2-sin^(2)A/2)/(sinA/2cosA/2)`
`=cosA/(1/2.(2sinA/2cosA/2))`
`=(2cosA)/(sinA)=2cotA`= RHS. Hence Proved.

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