\(\int _{L}(x+2y)\, dl\(, гдеL:L:L:r2=4cos2φ,π2≤φ≤−π2r2=4cos⁡2φ,π2≤φ≤−π2r^{2} =4\cos 2\varphi ,\, \, \, \, \, \frac{\pi }{2} \le \varphi \le -\frac{\pi }{2} , равен ……{\dots}