90=arctan0.5x+arctan10x+arctan0.03x+arctan0.0047x
    90=arctan0.03x+arctan0.0047x+arctan0.5x+arctan10x
    25x^2-0.25x^4=25×9
    90=arctan0.03x+arctan0.0047x
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*0.5995)
    90=arctan0.03x+arctan0.0047x
    arctanx = -2/3
    arctanx = -2/3
    arctanx=-2/3
    arctanx=-2/3
    (－1+7x)×(－1+7x)
    x^4
    s^3+√2*s^2+2s+1=0
    x+5=4
    -18m+486=36m+162
    2m^2-18m+486=2m^2+36m+162
    2(m+9)^2=(m-9)^2+(m-27)^2
    3000/x-3000/1.2x＝4
    3i+2i
    0.9^x=0.5

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