1/(0.158/44+0.0575/32+0.062/18+0.07225/28)
    286.33/10.60
    arctan(5/(2+5/tan60))
    arctan(10/(2.5+10/tan70))
    arctan(tan35*cos345)
    arctan((tan35*cos15-tan35*cos345)/(tan35*cos345-tan35*cos15))
    arctan(tan40*cos340)
    √28
    -4+√28
    4²-4*-3*15
    (1.8-0.331)/2+0.331
    √1081
    (39+√1081)/2
    39^2-440
    √35
    √36
    -5.994938^2
    2√5/5×3√10/10-√5/5×√10/10
    2√5/5×3√10/10
    2018^2019

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