$\lim_{x\to-\infty}\left(\frac{x^2+4x+1}{2x+7}\right)$
$\frac{8x^7y^7}{4x^2y^8}$
$2\left(a+9\right)$
$tanx=\:\frac{1-cos\left(2x\right)}{sin\left(2x\right)}$
$-3x+2x+2x$
$\lim_{x\to0}\left(x^4\cos\left(\frac{7}{x}\right)\right)$
$a^2-11a+45$
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