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If tan beta = (n tan alpha)/(1+(1-n)tan^...

If `tan beta = (n tan alpha)/(1+(1-n)tan^2 alpha)`, then `tan(alpha - beta)=` (i) `(1+n)tanalpha` (ii) `(1-n)tanalpha` (iii) `-(1+n)tanalpha` (iv) `-(1-n)tanalpha`

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