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For a gt 0, if f(x)=ax+b is an onto func...

For `a gt 0`, if `f(x)=ax+b` is an onto function from `[-1,1]` to `[0,2]` then `cot[tan^(-1). 1/7 +tan^(-1). 1/8+tan^(-1) . 1/5]=`

A

`f(-1)`

B

`f(1)`

C

`f(0)`

D

`f(2)`

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The correct Answer is:
B
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