$\left(\frac{3m^3}{9n^2}\right)^5$
$20+900$
$-4s+6s$
$\left(21x^2y^2-28x^3+56x^4\right)$
$x^2+6x-8=0$
$4cosx=5tagx$
$\frac{d}{dx}\ln\left(7x^2-3\right)$
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