arctan(tan(13)*(arctan(tan(20)/cos(13))))
    arctan(tan(20)/cos(13))
    sin30
    arctan（tan(13)*cos(arctan(tan(20)/cos(13)))）
    87654345678987654567456433456445323456987999999999999999999999999999999999938762567386254*9876543345675672627726523762516362353463254673276423845
    87654345678987654567456433456445323456987999999999999999999999999999999999938762567386254*9876543345675672627726523762516362353463254673276423845
    876545678876543456754*2876356781938
    114514*114514
    arctan（tan（20）/cos(13)）
    9+9*9-9/9
    exp（-1.25×2.84）
    1.0696^5
    5.8879^(-11)
    5.8879^-11
    1.1749^11
    （11243/1909.5）^-11
    （11243/1909.5）*-11
    5.3÷109.8
    3.4÷25
    14.6÷200

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