$\left\{2p+3q-r^2\right\}^2$
$y^3\frac{dy}{dx}\left(y^4+1\right)\cos\left(x\right)$
$\lim_{x\to1}\left(\frac{x^3+x^2-5x+3}{x^4-x^3-x^2+x}\right)$
$\:f\left(x\right)=x^4-x$
$4-169g^2$
$12a-34a$
$-\frac{9}{2}b+5a+a+b+3c-\frac{6}{3}b-\frac{5}{4}a$
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