65÷(80×6.5÷2)
    (3×3×3×3×3)^2
    3^7.174756−3^(－7.174756)
    x(x+1)(x+2)(x+3)(x+4)(x+5)(x+6)
    -1/12×4+2/3×4+3/5
    3^5+3^4-6*3^3-14*9-33-3
    0.5/0.013465
    arcsinx+x*sqrt(1-x^2) =0.785
    arctan1
    a^2-2a+1=0
    (0.75-e(-1))^0.5
    90-2*arctan2
    12/(1.1)+12/(1.1)^2+12/(1.1)^3+12/(1.1)^4+12/(1.1)^5+12/(1.1)^6+12/(1.1)^7+12/(1.1)^8+12/(1.1)^9+12/(1.1)^10
     3(2)^3+3(2)^2-18(2)
    3(-3)^3+3(-3)^2-18(-3)
    (10^4)/12 + (10^3)/3-(7.5)10^2
    221.43/7500
    7500*(1+4%/12)^36/36
    7500^(4%*3)/36
    7500*e^(4%*3)/36

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