Mathematics
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    cosx=0.900969
    cosx=0.809017
    sinx=0.809017
    (30-2x)+(20-2x)
    12*2+5+3+x+(5+3-x)
    1-(1-0.00001)^x
    X * 10%=4217
    0.02=e(-4.83x)*(1+4.83x)
    (45678+84567+78456+67845+56784)÷6
    (62345+23456+34562+45623+56234)÷5
    (12345+23451+34512+45123+51234)÷5
    (56789+67895+78956+89567+95678)÷7
    42x*0.85+0.15*15X = 14288*0.53
    20×2.56+512×0.09+1.28×4
    42x*0.85+0.15*15X=17948*0.53
    72.9×0.215+0.27×8.1+2.45×2.71
    147.75×8.4+4.79^(2)+409×2.1+0.9521×479
    20×2.56+512×0.09
    7.5×0.25+3×0.125+0.2×1.25
    19.98×37+199.8×2.3+9.99×80

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