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If tan theta=(1)/sqrt(5) and theta lies ...

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

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The correct Answer is:
A
`[RT]=[PV]=(ML^(-1)T^(-2))(L^(3))=ML^(2)T^(-2)=["Energy"]`
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