(0.1-(1-0.9^4))/(1-0.9)
    (0.1-(1-0.9^4)/(1-0.9)
    arctan56/33
    -arctan56/33
    arctan4/3+arctan12/5
    arctan3/4+arctan12/5
    (4+49/4)^1/2
    √2275
    50^3+45^3
    √3724
    60^3+60^3+62^3+62^3
    3-log(10,2.5625)-2.5625
    3-log(10,2.56255)-2.5625
    3-log(10,2.625)-2.625
    3-log(10.2.75)-2.75
    3-log(10,2.5)-2.5
    3-log(10,3)-3
    3-log(10,2)-2
    1+1
    8.5*480

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