cos[tan-1{sin(cot-1 x)}] = [(1 + x^2)/(1 - x^2)]^-1


prove it!!!! 

Taking L.H.S.,

∴ From (1), we get –

From (3),

Our aim is to find the value of cos y.

∴ From (5),

Hence, the R.H.S. given by you seems to be incorrect. The value on the R.H.S. in the statement should be .

Please check it again and then do get back to us.

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