$18-\left(_{-9}\right)$
$\int\frac{x+1}{4-x^2}dx$
$x^4-2x^3+x^2$
$\frac{\left(20x^4+28x^6-12x^8\right)}{\left(4x\right)}$
$\frac{4x}{3}=12$
$y=\left(1+\sqrt{1-x}\right)^2$
$\lim_{x\to0}\left(\frac{7x^2}{cosx^{-1}}\right)$
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