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If 0ltxltpi and cosx + sinx =1/2 , then ...

If `0ltxltpi` and `cosx + sinx =1/2` , then `tanx` is (1) `(4-sqrt(7))/3` (2) `-(4+sqrt(7))/3` ( 3) `(1+sqrt(7))/4` (4) `(1-sqrt(7))/4`

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