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यदि cot^(-1)(x)+cot^(-1)(17-x)=cot^(-1)(...

यदि `cot^(-1)(x)+cot^(-1)(17-x)=cot^(-1)(3)` हो, तो =

A

4

B

6

C

13

D

`-4`

लिखित उत्तर

Verified by Experts

The correct Answer is:
A
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