If x=sin alpha +sin beta, y=cos alpha +c...

If `x=sin alpha +sin beta`, `y=cos alpha +cos beta` then `tan alpha +tan beta=` (1) `(8xy)/(2(y^2-x^2)+(x^2+y^2)(x^2+y^2-2))` (2) `(4xy)/((y^2-x^2)+(x^2+y^2)(x^2+y^2-2))` (3) `(8xy)/((x^2+y^2)(x^2+y^2-2))` (4) `4xy`

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