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If ((3-tan^(2)theta))/(1-3tan^(2)theta)(...

If `((3-tan^(2)theta))/(1-3tan^(2)theta)((3-tan^(2)3 theta))/((1-3tan^(2)3 theta))((3-tan^(2)3 theta))/((1-3tan^(2)9 theta))...` `=(tan alpha)/(tan beta)`,then `(alpha+beta)/(theta)` is equal to - (A) `3^(n)+3` (B) `3^(n)-3` (C) `3^(n)+1` (D) `3^(n)-1`

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