$\lim_{x\to0}\left(\frac{5x^2-3x}{9x^2+5}\right)$
$x'=b\cdot d-2\cdot b\cdot x$
$\lim_{y\to x}\left(\frac{cos\left(xt\right)-cos\left(yt\right)}{x^2-y^2}\right)$
$\frac{4}{5}b\frac{4}{5}c\frac{4}{5}f$
$\sqrt{5}a^{2}-\sqrt{5}a+5\sqrt{5}ab$
$7^2-11^2$
$9x^2+4x-6$
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