arctan0.25
    1+1=2
    1+1=
    2:2
    (-21/5)^2+(18/5)^2-4×21/5-8×18/5+19
    (-21/5+3)^2+(18/5-2)^2+2×21/5-4×18/5+6
    (-21/5+3)^2+(18/5-2)^2
    (-21/5+3)^2+(18/5-22)^2
    (-21/5+3)^2+(18/5+2)^2
    (-21/5+3)^2+(18/5+2)^2+2×21/5-4×18/5+6
    (-21/5+3)^2+(18/5)^2+2×21/5-4×18/5+6
    10+2×21/5-4×18/5
    -21/5+2×18/5-5
    (18/5)^2-8×18/5+12+(21/5)^2-4×21/5+3
    (y-6)(y-2)=1
    (y-6)(y-2)
    (18/5-2)^2+(-21/5+3)^2
    (18/5+3)^2+(21/5-2)^2
    (18/5)^2+(21/5)^2
    (18/5-2)/(-21/5+1)

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