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If `tan theta=(1)/sqrt(5)` and `theta` lies in the first quadrant, the value of `cos theta` is :

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If `tan theta=(1)/sqrt(5)` and `theta` lies in the first quadrant, the value of `cos theta` is :
A. `sqrt((5)/(2))`
B. `-sqrt((5)/(6))`
C. `(1)/sqrt(6)`
D. `-(1)/sqrt(6)`
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Correct Answer - A
image `rArr cos theta=sqrt(5)/sqrt(6)`
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