$21\:-\:\left(-17\right)\:+\:\left(-44\right)$
$9x^2-30xy^3+25y^6$
$3x^2y^3\left(2xy-x-2y\right)$
$\frac{b^{7}}{b^{2}}$
$\frac{\tan\theta}{1-\cos^2\theta}$
$\frac{x^2-4x-45}{x-81}$
$\left(3x^3y-2x^2\right)^3$
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