(2х - у)² + (3х - у)(3х + у) + 4ху = 4х² - 4ху + у² + 9х² - у² + 4ху = 13х²;
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(2х - у)² + (3х - у)(3х + у) + 4ху = 4х² - 4ху + у² + 9х² - у² + 4ху = 13х²;