What is expand-(18x)/((x^2-9)^2) ?

The solution to expand-(18x)/((x^2-9)^2) is -(18x)/(x^4-18x^2+81)

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expand-(18x)/((x^2-9)^2)

expand

- \frac{18 x}{( x ^{2} - 9 ) ^{2}}

- \frac{18 x}{x ^{4} - 18 x ^{2} + 81}

Solution steps

- \frac{18 x}{( x ^{2} - 9 ) ^{2}}

(x^{2} - 9)^{2} = x^{4} - 18 x^{2} + 81

= - \frac{18 x}{x ^{4} - 18 x ^{2} + 81}

cos (x) (1 + tan (2 x))

\frac{( 1 - x ) ^{2}}{2}

(x + 3)^{4}

(x - \frac{2}{x})^{5}

(x - \frac{2}{x})^{3}

What is expand-(18x)/((x^2-9)^2) ?
The solution to expand-(18x)/((x^2-9)^2) is -(18x)/(x^4-18x^2+81)