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If tan^(2)alpha=1+2tan^(2)beta, then sqr...

If `tan^(2)alpha=1+2tan^(2)beta`, then `sqrt(2)cosalpha+cosbeta` is equal to (if `0ltalphalt90^(@)and90^(@)ltbetalt180^(@))`

A

0

B

`sqrt(2)`

C

1

D

`-1`

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A
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