$-3-9\left|1-3+\left(8+2-1\right)-\left(2-5\right)-13\right|+4-3$
$3\sec^23x-3=3\tan^23x$
$f\left(t\right)=\left(t-2\right)^2$
$\left(4y-5\right)\left(4y+5\right)$
$\frac{x+1}{x+3}\le2$
$\left(3x^2+x-2\right)^2$
$\int\:xe^{71x}dx$
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