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Does a math teacher in high school tell me how to solve this math problem? Many people in the class are wrong. Thank you.
Shit, tanx, tany is X? +3√3x+4=0 two roots,

∴tanx+tany=-3√3? ①

tanx tany=4? ②

∫tan(x+y)=(tanx+tany)/( 1-tanx tany)

=-3√3/( 1-4)

=√3.

∵ From ①tanx+tany=-3√3?

(2) tanx tany = 4

∴ tanx < 0, that is, -π/2 < x < 0.

Chen Shidan < 0, that is, -π/2 < y < 0,

∴-π