√（176.3584-x^2）＋√(174. 24-x^2）=2
    sqrt（176.3584-x^2）＋sqrt(174. 24-x^2）=2
    （√176.3584-x^2）＋（√174.24-x^2）=2
    arctan0.54
    arctan0.27
    arctan112.05
    arctan9.99
    （x＋2）（x-5）=1
    （x-250）（8+290-x/5乘4）=480
    7/12*x+12=3/5(x+12)
    (114.236*sin(3*29.154)-25)/(134.904-38.079*cos(3*29.154))
    2^-2
    sqrt205
    169+36
    13*13
    13x13
    sqrt2
    √2
    5x^2+60x+135
    x^2+12x+23

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