tan((2.43-485)/200)
    tan((485-2.43)/200)
    tan(485-2.43)
    tan(485-2.4.3)
    tan(2.43-485)
    arctan((2.43-485)
    arctan((2.43-485)/200)
    arctan((485-2.43)/200)
    arctan((62.8-1/314)/200)
    tan(-82.2)
    arctan(100×3.14-1/(1000×3.14×0.5))
    arctan(1868/9.32)
    arctan(1868/9.32)
    arctan(200/(20-1/100))
    arctan((20-1/100)/200)
    arctan(2.43/485)
    arctan(485/2.43)
    arctan(485/2.43)
    1-tan60*tan45
    285÷15×5

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