सही विकल्प चुनिए और अपने विकल्प का औचित्...

सही विकल्प चुनिए और अपने विकल्प का औचित्य दीजिए :
`(2 tan 30^(@))/(1 + tan^(2) 30^(@)) =`
`(A).sin 60^(@)`
`(B)cos 60^(@)`
`(C)tan 60^(@)`
`(D).sin 30^(@)`

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