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If "tan"^(-1)(1)/(4)+"tan"^(-1)(2)/(9)=(...

If `"tan"^(-1)(1)/(4)+"tan"^(-1)(2)/(9)=(1)/(2)cos^(-1)x` then x is equal to :

A

`(1)/(2)`

B

`(2)/(5)`

C

`(3)/(5)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
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