$\frac{x^2+5x-3}{x+5}$
$\int\left(\sqrt{x}-\frac{3}{x}\right)^2xdx$
$12+9r-4+8r$
$\left(+1\right)+\left(-39\right)$
$\sin\left(4x\right)-\sin\left(3x\right)+\sin\left(2x\right)-\sin\left(x\right)$
$-9x-3-\left(5x+3\right)-7$
$\lim_{x\to-4}\frac{x^2-16}{x^2-4x}$
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