If alpha is an acute angle and sinalpha ...

If `alpha` is an acute angle and `sinalpha = sqrt((x-1)/(2x))`, then what is tan a equal to ?

A

`sqrt((x-1)/(x+1))`

B

`sqrt((x+1)/(x-1))`

C

`sqrt(x^(2)-1)`

D

`sqrt(x^(2) +1)`

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