$10+8+9\cdot4$
$f\left(x\right)=\sqrt{\frac{x^2-9}{2x^2+7x+3}}$
$\sqrt{36-6cos\left(x\right)^2}$
$\frac{1}{x+3}=\frac{1}{x}+\frac{1}{3}$
$4x^2-12x+9+5$
$60+9a^2+1$
$\int\frac{4x^2}{x^2+9}dx$
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