$\left(x^2-xy-y^2\right)\left(x^2+xy-y^2\right)$
$\frac{\sin\left(a\right)+\sin\left(2a\right)}{1+\cos\left(a\right)+\cos\left(2a\right)}$
$25x^2-10x\:+\:1$
$\int\left(\left(3x^2+1\right)\sin\left(x^3+x\right)\right)dx$
$+4+-8+7$
$-18x-6x+3xy-12x-15xy$
$\frac{7\cdot6\cdot5\cdot4\cdot3\cdot2\cdot1}{4\cdot3\cdot2\cdot1\:\:\:\cdot\:\:\:3\cdot2\cdot1}$
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