1.

(1)/(2) tan"" ((x)/(2) ) + (1)/( 4) (tan"" (x)/(4) ) + ...... + (1)/(2^(n) ) tan"" ((x)/( 2^n) ) =

Answer»

`(1)/( 2^n) COT ((X)/( 2^n) )`
`(1)/( 2^n) cot((x)/( 2^n) ) + cot x`
`(1)/( 2^n) cot ( (x)/( 2^n) ) - cot x`
`cot ((x)/( 2^n) ) -cot x`

ANSWER :C


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