$18^2+24x$
$\int\:\:x^3e^{-2x}dx$
$\frac{1}{\cos^2\left(a\right)}-\frac{1}{\cot^2\left(a\right)}=1$
$f\left(x\right)=5\left(x^2+3x-2\right)-\left(2x+4\right)^2$
$sec^2x-4$
$\frac{9^2}{4}+ab+b^2$
$\left(-xy+\frac{5}{8}\right)\left(xy-\frac{3}{4}\right)$
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