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If tanalpha=(1+2^(-x))^(-1), tan beta=(1...

If `tanalpha=(1+2^(-x))^(-1), tan beta=(1+2^(x+1))^(-1)`, then `alpha+beta`=

A

`pi//6`

B

`pi//4`

C

`pi//3`

D

`pi//2`

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The correct Answer is:
C
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