$1-25x^2x^2$
$a^{10}-4ak^6$
$e^x\cdot e$
$\frac{\csc\left(a\right)}{\sin\left(a\right)}-\frac{\cot\left(a\right)}{\tan\left(a\right)}$
$4a^2-3ab+3b^2-7a^2-6ab+4b^2$
$\frac{x^2}{x^2+1}=1$
$\left(-2ab+3c\right)^3$
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