arctan0.067
    arctan（1/15）
    arctan0.667
    arctan1/15
    tan1/15
    360+92*6
    128-92
    7.18×1.43
    4.43/6.430
    4.4×0.8√((0.0056+0.13×0.06-0.002)815.09/2.93)
    (4×〖10〗^(-3)×20.72)/(807.06×9.81×0.005)
    (3^-5)^2
    ((5.7×10^(-6))/(20.27×10^(-3) ))×(0.66/(0.4-2.5×0.06))^3.2
    (5.7×〖10〗^(-6))/(20.27×〖10〗^(-3) )×〖(0.66/(0.4-2.5×0.06))〗^3.2
    0.051×（2.93/815.09)×(4.43/0.8)^2
    sin30*cos60
    asin(π)
    (tan45)^2
    （4-1.6）*600+（6-3.5）*1000+（2-1.2）*1300-1000-600-200
    （2660-600-800-288）*75%/1000

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