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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

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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
A. `2cot2x-(1)/(2^(n-1))cos""((x)/(2^(n-1)))`
B. `(1)/(2^(n-1))cot""((x)/(2^(n-1)))-2cot2x`
C. `cot""((x)/(2^(n-1)))-cot2x`
D. none of these
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1 Answer

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Correct Answer - B
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