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If tantheta=(-1)/(sqrt5)andtheta lies in...

If `tantheta=(-1)/(sqrt5)andtheta` lies in the fourth quadrant, then: `costheta=`

A

`(sqrt5)/(sqrt6)`

B

`(2)/(sqrt6)`

C

`1/2`

D

`1/sqrt6`

Text Solution

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A
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