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If f(x) = cos^(-1)[( x - x^(-1))/(x + x^...

If `f(x) = cos^(-1)[( x - x^(-1))/(x + x^(-1))]` then `f'( -2)` is

A

`(2)/(5)`

B

`(-2)/(5)`

C

`(-1)/(5)`

D

None of these

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IPUCET PREVIOUS YEAR PAPERS-GGSIPU MATHMATICS 2013-MCQs
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