cos50*cos50
    4.18*10^16*366^(3/2)*e^(-7019/366)
    acos(-0.5)
    cos1.106
    cos(0.5)
    cos(0.25)
    acos(0.707)
    acos(0.7)
    e^arctan1/2
    e^arctan1/2
    600-50+350-100-279-19×4-18-16+400-139-29-18-18-135-55-10-80-29-39-8-13-89+300-6-60-15-15-36-11-21+200-179-19-2-40-70
    (45*3.14159/180)*5
    (45*3.14159/180)*5
    (45*3.14159/180)*5
    2/3÷1/6+2/3÷5/6
    15*14.5-15
    15*14.5-15
    1cos1-sin1
    -1cos（-1）-sin（-1）
    -1cos-1-sin-1

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