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    500/x=(60-x)
    t^2+15t-150=0
    x^3-4x^2-x+1=0
    (0.3-0.01X)(500+40x)=180
    x^3-4x^2-x+1=0
    (0.3+0.01X)(500+40x)=180
    x^3-4x^2-1x+1=0
    x∧2+0.558x=0.558×0.01
    x^3-4x^2-11x+1=0
    x∧2
    x^3-4x^2-9x+1=0
    57+49÷60=2×arcsin(1.463×r)-2×arcsin(r)
    153+38÷60=2×arcsin(√((4-n^2)÷3))-4×arcsin(√((4-n^2)÷3÷n^2))+180
    x^1/2*ln(x-2)
    2X^(3)+22X^(2)+80X+64=0
    sin(153+38÷60)=√((4-n^2)÷3)
    arctan(0.1x)+arctan(0.2x)=90
    1÷2=sinx
    arctan(0.1x)+arctan(072x)=90
    -arctan(x)-arctan(2x)-arctan(3x)=-180

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