$\frac{25x^2-y^4}{5x-y^2}$
$\sin\left(x\right)\cot\left(x\right)+\sin\left(x\right)\tan\left(x\right)$
$12^2-4\left(1\right)\left(-3\right)$
$\left(a^3-b\right)^3$
$\frac{x^2+2x-15}{x-1}$
$255+-55+-10+15+10$
$2y^2+20y+25$
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