$\lim_{x\to-3}\:x^3-2x^2+1$
$25x^2+40xn+16n^2$
$196z^8-225v^{12}$
$\left(3+x^2\right)\frac{dy}{dx}=6x\:+yx$
$x^5+2x^4-x-8:x^2-2x+1$
$\int\frac{\sqrt{10-\:x^2}}{x}dx$
$\left(1+\csc a\right)\left(1-\csc a\right)$
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