∫L(x2+y2)dx+ydy∫L(x2+y2)dx+ydy\int _{L}\left(x^{2} +y^{2} \right)\, dx+ydy, гдеL:{x2+y2=9x≥0L:{x2+y2=9x≥0L:\, \, \left\{\begin{array}{c} {x^{2} +y^{2} =9} \\ {x\ge 0} \end{array}\right., равен ……{\dots}