$-509-696$
$x^2-10x-2=\left(x-4\right)^2+5\left(x+2\right)$
$9u^2+30u+25$
$n^{2\:}=4$
$-2x+3\:x-5$
$\int\frac{1}{4x-2}dx$
$\frac{\sin\left(x\right)}{1+\cos\left(x\right)}+\frac{1+\cos\left(x\right)}{\sin\left(x\right)}=2\cos\sec a$
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