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If x(1),x(2),….x(20) are in H.P then x(1...

If `x_(1),x_(2),….x_(20)` are in H.P then `x_(1)x_(2)+x_(2)x_(3)+….+x_(19)x_(20)`=

A

`ln(1-x)/(1+x)`

B

`ln(2+x)/(1-x)`

C

`tan^(-1)(1-x)/(1+x)`

D

`tan^(-1)(1_x)/(1-x)`

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A
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PUNEET DOGRA-FUNCTIONS-PREV YEAR QUESTIONS
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