If sinx+cosx=(sqrt(7))/2, where x in 1s...

If `sinx+cosx=(sqrt(7))/2,` where `x in 1s t` quadrant, then `tanx/2` is equal to (a) `(3-sqrt(7))/3` (b) `(sqrt(7)-2)/3` (c) `(4-sqrt(7))/4` (d) none of these

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