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प्रश्न
Select the correct option from the given alternatives:
`2 "tan"^-1 (1/3) + "tan"^-1 (1/7) =` _____
पर्याय
`"tan"^-1(4/5)`
`pi/2`
1
`pi/4`
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उत्तर
`2 "tan"^-1 (1/3) + "tan"^-1 (1/7) = pi/4`.
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