Mathematics
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    tan90 0/0
    sqrt-1
    arctan(-3)
    arctan(26/7)
    arctan(-5/3)
    4200*20
    7560000/4200*20
    9000000*84%
     arctan(2/3)
    -0.588003/3.14159
    arctan(-2/3)
    500-12.5
    34500000/1533.3336
    23/54*3600
    10%*((1000000*50)/(1000000*50+30000000))+7%*(30000000/(1000000*50+30000000))=
    1037.80*100^−0.69
    1037.80*10^−0.69
    46*8
    46/45*72
    3680/60

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