$\lim x\to\:0\frac{\left(cosx-sinx-1\right)}{2x}$
$\frac{\left(a^4\right)^2}{a^5}$
$\left(4z-3w^2\right)^4$
$\frac{\left(27x^2+36xy+12y^2\right)}{108}$
$-30\left(-17+17\right)$
$p\left(x\right)=x^2-3x-40$
$i\left(x\right)\frac{-3x+6}{x}$
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