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The most general value for which `tantheta = -1 " and " costheta = 1/(sqrt(2)) " is " (n in Z)`

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The most general value for which `tantheta = -1 " and " costheta = 1/(sqrt(2)) " is " (n in Z)`
A. `n pi+(7 pi)/4`
B. `n pi+(-1)^(n) (7pi)/4`
C. `2npi+(7pi)/4`
D. none of these
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Correct Answer - C
Since `tan theta lt 0` and `cos theta gt 0, theta` lies in the fourth quadrant. Then `theta=7 pi//4`.
Hence, the general value of `theta` is `2n pi+7 pi//4, n in Z`.
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