70% ×6/7-80% ×3/8
    666*5
    arccos664.7732463
    -arctan(1/3)
    arctan-0.33333333
    arctan-1.333
    arctan176/132
    arccos44/132
    arctan44/132
    22*sin(-53.1)
    22*sin53.1
    (32*80-256)/25
    22*cos53.1
    22+32+1112
    2-0.144-0.036
    log(5,6)+log(6,5)
    90-arctan(0.5*2*sqrt(5))-arctan(0.1*2*sqrt(5))
    tan55
    arctan58
    1-3.14*0.86^2（2+0.84^2）*（3*4.5-2*0.86*sqrt(1-0.84^2）)/(12*4.5^3)

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