$25\left(x-y\right)^2-4\left(x+y\right)^2$
$10x^5-25x^4+35ax^3-75a^2x^2$
$2^{2}-4x-5$
$\lim_{x\to0}\left(\frac{2x-2}{x^2-1}\right)$
$\int\left(x\right)\sin\left(ax\right)^2dx$
$2\left(y+3\right)-10$
$225t^2-1$
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