If `tantheta=(-1)/(sqrt5)andtheta` lies in the fourth quadrant, then: `costheta=` (a) `sqrt(5/6)` (b) `2/sqrt6` (c) `1/2` (d) `1

If `tantheta=(-1)/(sqrt5)andtheta` lies in the fourth quadrant, then: `costheta=` (a) `sqrt(5/6)` (b) `2/sqrt6` (c) `1/2` (d) `1/sqrt6`
A. `(sqrt5)/(sqrt6)`
B. `(2)/(sqrt6)`
C. `1/2`
D. `1/sqrt6`

If `tantheta=(-1)/(sqrt5)andtheta` lies in the fourth quadrant, then: `costheta=` (a) `sqrt(5/6)` (b) `2/sqrt6` (c) `1/2` (d) `1/sqrt6`

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