1.

For x in R, tanx+1/2tan""(1)/(2^(2))tan""(x)/(2^(2))+...+(1)/(2^(n-1))tan""((x)/(2^(n-1))) is equal to

Answer»

`2cot2x-(1)/(2^(n-1))COS""((X)/(2^(n-1)))`
`(1)/(2^(n-1))COT""((x)/(2^(n-1)))-2cot2x`
`cot""((x)/(2^(n-1)))-cot2x`
none of these

Answer :B


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