√490
    √4444
     5/7+2/9+2/7+7/9
    29-45
    tan50
    arccos0.46
    176*0.706105/(1-(0.706105^2))^0.5+57.5*9/16*(9/16)*0.706105/(1-81/256*((9/16)*0.706105^2))=
    arcsin0.3971840625
    arcsin0.706105
    6.5/1.6
    7/1.6
    4/1.6
    2144480*[(1+0.00510)^60-1]=
     (10000*1.4^10-10000)/2+10000
     (10000*1.4^9-10000)/2+10000
    （8/15）/（1/30）
     e3
    1/304.17-(8.315*ln(0.8845))/24404.0742
    sqrt（—1）
    arctan 0.5

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