arccos(0.05/1.2)
    1/cos(0.05/1.2)
    1/cos(0.05/1.2)
    0.037*sin75
    0.037*cos75
    400(0.048-0.01(1+sin25.3))*0.005*sin(24.7-5)/sin25.3cos45
    400(0.048-0.01(1+sin25.3))*0.005*cos(24.7-5)/sin25.3cos45
    2+4/7
    arcsin0.29465
    2^7
    √e^ln2
    √e^ln2
    e^ln2/2
    e^1/2（1+ln2）
    1/4ln8-3/4ln2
    377/(0.85×0.85)×0.8
    874.5/(0.85×0.85)×0.8
    925.2/(0.85×0.85)×0.8
    456.9/(0.85×0.85)×0.8
    320.9/(0.85×0.85)

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