tan（arccos0.899）-tan（arccos0.92）=
    tan（arccos0.73）-tan（arccos0.92）
    -arctan(0.25)-arctan(1)
    -arctan(40)-arctan(160)
    1800/761*4500/1.6
    0.02 × 20 × [0.3 + (0.9 − 0.12) × 2]
    25 × 0.3 × (0.9 − 0.12)
    209.282×0.12
    59.63×0.12
    262.12×0.12
    2.092×7.2×2
    arctan(4.89)
    arctan(3.1)
    arctan(1.05)
    arctan(-1.53)
    arctan(-5.44)
    arctan(-14.65)
    arctan(2.45)
    arctan(0.52)
    !(sqrt(-1))

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