$x^2-\frac{2}{5}+\frac{1}{25}$
$\left(-9x^2-10y\right)^2$
$2^2\cdot81$
$5+\left|-18+11\right|+\left(7+-15\right)-10$
$\frac{d^2}{dx^2}\left(x^2y^3-2x^4y\right)$
$x^2\left(x+2\right)+xy\left(x+2\right)$
$\sin\left(x\right)-\sin\left(x\right)x\:\cos^2x$
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