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The value of (cot (x/2)-t a n x/2)^2(1-2...

The value of `(cot (x/2)-t a n x/2)^2(1-2tanxcot2x)` is 1 (b) 2 (c) 3 (d) 4

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Given,
`(cot (x/2)-tan(x/2))^2(1-2tanxcot2x)`
firstly,
`=>(cot (x/2)-tan(x/2))^2`
`=>(1/(tan(x/2))-tan(x/2))^2`
`=>((1-tan^2(x/2))^2/(tan(x/2)))^2`
`=>(2(1-tan^2(x/2)))^2/(2(tan(x/2))^2`
`=>2^2((1-tan^2(x/2))/(2tan(x/2)))^2`
...
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