$\:k^2-14k-68=-2$
$x^2-2x-14=0$
$\lim_{x\to\frac{\pi}{2}}\left(1-tan\left(x\right)sec2x\right)$
$\int\frac{4}{\left(x+2\right)\left(x^2+6x+8\right)}dx$
$\left(x+xy^2\right)dx+e^{x^2}ydy$
$\left(x+5\right)\left(y+3\right)$
$3x^2+2x^2-x^2-x$
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