Question

плз хелп всё на картинке​

Answer 1

$frac{x^2}{y^2}-2+frac{y^2}{x^2}=(frac{x}{y}-frac{y}{x})^2\\frac{a^2}{4b^2}+2+frac{4b^2}{a^2}=(frac{a}{2b}+frac{2b}{a})^2\\frac{9x^2}{4y^2}-frac{1}{y}+frac{1}{9x^2}=(frac{3x}{2y}-frac{1}{3x})^2$