$\lim_{x\to-2.1}\left(\frac{x^4-4}{x+2}\right)$
$\int sin\left(5x\right)cos\left(8x\right)dx$
$x^2-15x+13$
$\left(x+a\right)^2+5\left(x+a\right)+4$
$457.03+560.8+48.37$
$20x^2y^2-28x^2y^3+8xy^3$
$tan^2\left(-x\right)+1$
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