0.6×11.90×0.9+0.617×1.08×0.9
    (1.12×10^6)/166667
    0.1×11.90×〖0.9〗^2+0.177×1.08×〖0.9〗^2
    1.1×[1.0×(2.12+0.103+0.39+39)+1.0×(2.5+0.78)]×0.2
    1.1×1.5×(2.5+0.78)×0.2
    1.1×1.3×(2.12+0.103+0.39+39)×0.2
    0.677×(48.95×200^4)/(100×9896×281250)
    (0.27×10^6)/37500
    0.1×58.95×〖0.2〗^2+0.177×5.41×〖0.2〗^2
    1.1×[1.0×(2.12+0.103+39)+1.0×(2.5+0.78)]×1
    1.1×1.5×(2.5+0.78)×1
    1.1×1.3×(2.12+0.103+39)×1
    tan30*5.5
    tan20*5.5
    tan10*5.5
    tan45*5.5
    tan60*5.5
    (684.9×10^3)/(0.738×20407.8)
    arctan(113/550)
    arctan(113/550)

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