cos23
    cos30
    cos30
    381×(1-2%)
    380987÷(1+9%）×(1+6.9%)
    380987÷(1+9）×(1+6.9%)
    380987÷(1+9%）
    (0.78+2.243*1.5^0.5)*0.5*(0.993+0.18*0.5-1.06*0.5^2+1.71*0.5^3)
    (1.5/(1.55*2-1.3))^0.72
    (2-1+0.5*1.5^0.5)/(2-1+1.5^0.5)
    (2-1+0.5*1.5^0.5)/(2-1+1.5^0.5)
    (2-1+0.5*1.5^0.5)/(2-1+1.5^0.5)
    (2-1+0.5*1.5^0.5)/(2-1+1.5^0.5)
    (2-1+0.5*1.5^0.5)/(2-1+1.5^0.5)
    (2-1+0.5*1.5^0.5)/(2-1+1.5^0.5)
    (2-1+0.5*1.5^0.5)/(2-1+1.5^0.5)
    (2-1+0.5*1.5^0.5)/(2-1+1.5^0.5)
    (2-1+0.5*1.5^0.5)/(2-1+1.5^0.5)
    3.48-4.964*0.5+3.41*0.5^2-0.9313*0.5^3
    (3.5/3.8666)^0.777

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