$a^3\cdot4a^2.3a^3.a^2$
$\frac{5x^2+19x+15}{x+3}$
$3\frac{3x}{5x-4}-4x^2$
$3y^2-33y+54$
$a^2-ab+b^2^2$
$\cot\left(a\right)=\frac{\csc\left(a\right)}{\sec\left(a\right)}$
$\lim_{x\to1}\left(\frac{1-2x}{x^2}\right)$
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