1/10×99.48×0.3^2
    1.2×75.9+1.4×(2+4)
    0.22×25×20×1.2×1.15×(0.25)^0.5
    (1000×15^2)/6
    (1000×18^3)/12
    (1000×15^3)/12
    (1000×153)/12
    (1+0.2*0.6^2)^(1.4/0.4)
    (1+0.2*2*2)^(1.4/0.4)
    (1+0.2*0.6*0.6)^(1.4/0.4)
    0.2*2^2*(2.4^2*4/(4*1.4*4-2*0.4))^(1/0.4)
    arctan10
    tan150
    tan180
    tan-180
    cos-180
    cos180
    cos23
    cos2
    2^-20

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