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If tan(alpha-beta)=(sin2beta,)/(3-cos2be...

If `tan(alpha-beta)=(sin2beta,)/(3-cos2beta)` then (a)`tanalpha=2tanbeta` (b) `tanbeta=2tanalpha` (c)`2tanalpha=3tanbeta` (d) `3tanalpha=2tanbeta`

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