90-arctan4.42
    2^26
    (60+30+20+15+12)/5
    5^0.8
    5^.8
    1000/463.19=
    7/6×4/1+7/6÷3/4
    2/3*3/8+2/3
    15*7.5+14
    15/7
    3/7+2/1.5
    2^arcsin0.8
    5^arccos0.7
    5^arccos2
    arccos4.7
    arctan29
    25/0.7
    3*（2/3）^4-4*（2/3）^3+1
    26.25*0.8
    3.5*2.5*3

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