tan0.1
    1+-(-1)
     (2.7850^2-0.324^2)^(0.5)+(2.7881^2-(0.324-0.272)^2)^(0.5)
     (2.7850^2-0.335^2)^(0.5)+(2.7881^2-(0.335-0.272)^2)^(0.5)
    (2.7850^2-0.314^2)^(0.5)+(2.7881^2-(0.314-0.272)^2)^(0.5)
    (2.7850^2-0.314^2)^(0.5)-(2.7881^2-(0.314-0.272)^2)^(0.5）
    (2.7850^2-0.3142^2)^(0.5)+(2.7881^2-(0.3142-0.272)^2)^(0.5)
    (2.7850^2-0.334^2)^(0.5)+(2.7881^2-(0.314-0.272)^2)^(0.5)
    (2.7850^2-0.335^2)^(0.5)+(2.7881^2-(0.335-0.272)^2)^(0.5）
    (2.7850^2-0.335^2)^(0.5)-(2.7881^2-(0.335-0.272)^2)^(0.5）
    90-arctan(0.4)-arctan(0.4/5)
    2*arctan(1)-arctan(1.814694)-arctan(1.814694/5)
    1.99*10
    100-10%
    1000-1000*10%
    1000-10%=
     C(4,2)
     C(4,4)
     A(4,4)
     A(4,3)

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