$\left(2x^4y\right)\left(9xy^{-4}\right)$
$2\left(-7a+5b\right)-4\left(-5a+8b\right)+2$
$x^3\cdot x^6$
$12x^3-15x^3y^4+15y^5$
$\lim_{x\to2}\left(\frac{\tan^2\left(x-4\right)}{x^2-4}\right)$
$\sqrt{36x^7y^{10}}$
$x^2y'+xy=-8$
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