8/9-(8/9-9/25)
    arctan(20/9)
    arctan20/9
    1/21/3
     1800/2.7*2.4=
    1800/2.7*1.4
    1177/2.7*1.4
    arccos0.395
    arccos0.395
    999999^2
    99999^2
    arctan0.95
    arctan0.95
    123456789*987654321
    arctan20
    arctan20
    24×(tan29.841-tan20)+96×(tan19.999936-tan20)
    arccos0.939693
    arccos0.939693
    96×cos20÷96

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