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x+y=π x-y=π-4 x-y=π x+y=π-4
(-2,ln5) (-1,ln2) (1,ln2) (2,ln5)
x+y=π x--y=π-4 x-y=π x+y=π+4
(-2,ln5) (-1,ln2) (1,ln2) (2,ln5)
(-2,ln5) (-1,ln2) (1,ln2) (2,ln5)
5x±3y=0 3x±5y=0 4x±5y=0 5x±4y=0
x+4y-2=0 x-4y+2=0 4x+2y-1=0 4x-2y-1=0
(-2,ln5) (-1,ln2) (1,ln2) (2,ln5)