v² dx + x(xt y) dx = 0 LINE 1 let x= v2, dx = yda+ zdy y2 (ydz + zdv) + xz(vz +Y)dy= 0 vz (vdz t zdv) + v22 (2+) dy=0 yda + zdv + (22+1) dy yda + (22 t 22) dy dz 22+22 but, LINE 2 LINE 3 LINE 4 LINE S LUNE 6 dy LINE 7 2+22 之十2 LINE 8 V2 22+22 2+2 LINE 9 十 ネ十2ノ42 + 2 In (2) - 2 In (z+2) + InV) = C In (a) - In (2+2) + In(y2) = c dr. LINE 10 INE II LINE 12 In = C. LINE 13 C 2+2 LIND 4 /Aヤス yメ LINE 5

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