Question

плз хелп всё на картинке​

Answer 1

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