(4042-2/2019）/2020
    4042-2/2019
    -0.001*0.04402^3+0.418*0.04402^2-8.341*0.04402+220.9
    -0.001*0.05264^3+0.148*0.05264^2-8.341*0.05264+220.9
    1+21.8%
    arctan（11÷3）
    arctan11÷3
    arctan200÷100
    arctan200÷100
    arctan100÷200
    467+677
    sin(120)
    cos(120)
    sin(-120)
    cos(-120)
    sin(16π*(2)/5+π/4)
    sin(16π/5+π/4)
    sin(π/4)
    sin(16π*(-1)/5+π/4)
    sin(16π*(-2)/5+π/4)

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