$x^2+45x+45$
$\lim_{x\to\infty}\left(1+\frac{3.3}{x}\right)^x$
$\left(a+\frac{1}{4}b\right)\left(a+\frac{3}{4}b\right)$
$\frac{cos\:x}{sin\:x}+\frac{sin\:x}{cos\:x}$
$\left(\frac{1}{x-4}\right)-\left(\frac{3}{3}\right)$
$\left(t+4\right)^2$
$\lim_{x\to6}\left(\frac{x^2-36}{x-4}\right)$
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