atan(200)
    atan(100)
    arctan1/1000π
    arctan1/20π
    arctan5/π
    arctan5/π
    arccos0.4826
    arccos0.5480
    arccos0.8635
    arccos0.8125
    arccos0.8125
    arccos0.7615
    arccos0.7210
    arccos0.6765
    arccos0.6765
    10063 ×50×3142/(4357+10731)
    10063 ×50×7071/(4357+10731)
    10063 ×50×421/(4357+10731)
    10063 ×50×97/(4357+10731)
    10063 ×50×554/(4357+10731)

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