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If tan alpha = 1/7 and sin beta =1/sqrt(...

If `tan alpha = 1/7` and `sin beta =1/sqrt(10)`, where `0 < alpha, beta < pi/2`, then `2 beta` is equal to (i) `pi/4-alpha` (ii) `(3pi)/4-alpha` (iii) `pi/8-alpha/2` (iv) `(3pi)/8-alpha/2`

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