$\frac{dy}{dx}=\frac{1}{1+x^2}+x^2$
$\sin^2\left(x\right)=\frac{3}{4}$
$\lim_{a\to-3}\left(\frac{a^3+27}{a+3}\right)$
$4\left(x+1\right)+u=5\left(u-1\right)+9$
$\int\left(\:x^4\sqrt{5x+3}\right)dx$
$x^2+bx+\frac{b^2}{4}$
$a+2a-2a$
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