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If alpha=tan^(-1)(t a n(5pi)/4)a n dbeta...

If `alpha=tan^(-1)(t a n(5pi)/4)a n dbeta=tan^(-1)(-tan(2pi)/3),t h e n` `4alpha=3beta` (b) `3alpha=4beta` (c) `alpha-beta=74alpha=(3beta)/(12)` none of these

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If alpha=tan^(-1)(t a n(5pi)/4)a n dbeta=tan^(-1)(-tan((2pi)/3)),t h e n (a) 4alpha=3beta (b) 3alpha=4beta (c) alpha-beta=74alpha=(3beta)/(12) (d) none of these

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