$\:7^{-2}\cdot\:7^6$
$\left(2senx-1\right)\left(senx-1\right)=0$
$x^2+8x-18$
$4y^2x^2+36xy^3+81y^4$
$\left(s+10\right)^2$
$32x+5x$
$\frac{x-1}{x-1}$
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