$\left(x+5\right)\cdot\:\left(x^2-5x+25\right)$
$25x^2-25y^4$
$6tan180^{\circ}+5sin270^{\circ}$
$2i-1\left(i^2+i\right)$
$\frac{dy}{dx}+\left(\frac{3}{x}-1\right)y=-\frac{2}{x}$
$\lim_{x\to\infty}\left(\frac{2x^2+7x-5}{2x^2-3x+1}\right)$
$\frac{j^5-3j^3+4j-6}{j-2}$
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