$\left(x^2+2xy+y^2\right)dx+\left(2xy+x^2-1\right)dy=0$
$a^2-b^2;\:a=3\:,\:b=-2$
$\lim_{x\to0\:}\left(\frac{tan\left(9x\right)}{tan\left(4x\right)}\right)$
$\left(x^{a+1}+4^{x-2}\right)^2$
$\frac{12x^4}{4x^{16}}$
$-\frac{3450}{50}$
$\lim_{x\to\infty}\left(\frac{6^{2x}}{e^{2x}}\right)$
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