$k=\frac{-senx2sen3xsenx}{sen3xsen2x}$
$xy^{2\:}=\:4e^{3x}.\:y\:-\:2x^2y$
$x^2+10x+1$
$\left(x\right)=2x^2+9x+1$
$\frac{\left(2-x^2\right)^2}{4}$
$\frac{x^3-5x}{x^2+8}$
$\lim_{x\to\infty\:}\left(\frac{e^{\frac{x}{2}}}{x^2+2x+3}\right)$
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