The general value of theta in the equati...

The general value of `theta` in the equation `costheta=1/sqrt2, tantheta=-1` is

A

`2npi+-pi/6, n inI`

B

`2npi+(7pi)/4, n in I`

C

`npi+(-1)^n pi/3, n in I`

D

`npi+(-1)^n pi/4, n in I`

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The correct Answer is:

B

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