cos（40.192）
    180+arctan(0.5*18)-180-2*arctan(0.02*18)=
    0.3*300*400+14.3^2
    sin（13.227596）
    cos（13.227596）
    11.24+12.94+13.38+10.25+10.41+12.63
    75-2
    {1-[(0.6235+0.7778)-(0.6235*0.7778)]}÷(1-0.8766)
    {1-[(0.6235+0.8234)-(0.6235*0.8234)]}÷(1-0.9127)
    {1-[(0.6235+0.7449)-(0.6235*0.7449)]}÷(1-0.8131)
    {1-[(0.6235+0.6926)-(0.6235*0.6926)]}÷(1-0.7013)
    {1-[(0.6235+0.3220)-(0.6235*0.3220)]}÷(1-0.5930)
    {1-[(0.498+0.468)-(0.498*0.468)]}÷(1-0.488)
    {1-[(0.498+0.635)-(0.498*0.635)]}÷(1-0.801)
    {1-[(0.498+0.561)-(0.498*0.561)]}÷(1-0.671)
    {1-[(0.498+0.505)-(0.498*0.505)]}÷(1-0.535)
    {1-[(0.498+0.392)-(0.498*0.392)]}÷(1-0.428)
    1+e^(-cos1)
    (1250+1500)/2
    (10.5+2.25)/((7000−1000)×0.839×0.9)

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