sin（5π/2）
    sin（4π/2）
    sin（3π/2）
    sin（3π）/2
    97790÷(1+8.3%)×(1+6.9%)
    97790×(1+8.3%)×(1+6.9%)
    97790÷(1+8.3%)×(1+6.9%)
    8.3%×6.9%
    8.3%÷6.9%
    97790÷(1+8.3%）×(1+6.9%)
    (1+8.3%）×(1+6.9%)
    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

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