$\frac{4z}{z^2\left(z^2+7\right)}$
$\lim_{x\to\infty}\left(\frac{e^{7x-9}}{8x}\right)$
$\frac{\left(6x^4-5x^3+2x^2-3x+2\right)}{\left(2x^2+1\right)}$
$sen30.sen\:60-cos\:30$
$8,321+389,669$
$\sqrt{\frac{18x^3}{2y^2}}$
$\frac{\cos\left(z\right)}{\sin\left(z\right)}$
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