$216y^6+729x^3$
$5a^2b\cdot3a^{-3}b^4$
$\lim_{x\to2}\left(\sqrt{x^2-4}\right)$
$\frac{1}{4}x^2y^2+\frac{7}{8}x+8x+8^4+\frac{3}{8}x^2y^2-9x$
$3xy+4x$
$cosx=\frac{7}{5}$
$s^2+3s-2$
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