$\frac{4}{3}\left(90.3\right)$
$x^2.\:2x$
$45ab-15a^2bc$
$x^2+40x+150$
$\left(1+x^3\right)^{-\frac{1}{2}}$
$9x^2+z^2-y+18+12$
$-cosx\cdot cot^2x$
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