0.4/100.058＝x/36.5
    arctan1/tw
    （42.309+x）×1.55＝73.118-x+42.309
    2X*X=128
    tanx=0.011
    tanx=0.011
    tax=0.011
    k/6=1
    a(3a-1)=2
    [-2(a-1)/a]^2-3*(a^2-a-2)/a=16
    x^2-2*(1-1)x+1-1-2=0
    x^2-2*(2-1)x+4-2-2=0
    √x=4x-12
    x^1/2=4x-12
    x^2+3x+2=0
    2.1752×15=3.4-10000×i+100×(㏑(3.4×10^(-4))-㏑i)
    -1-x=1/4(3-x)
    (0.3x÷(1-0.02x²)) = 0.7
    arctan(0.3x÷(1-0.02x²))＝35
    -90-arctan0.1x-arctan0.2x = -135

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