If theta and phi are angles in the 1^(st...

If `theta` and `phi` are angles in the `1^(st)` quadrant such that `1^sttantheta=1/7` and `sinphi=1/sqrt10`, then

A

`theta+2phi=90^@`

B

`theta+2phi=60^@`

C

theta+2phi=30^@`

D

`theta+2phi=45^@`

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