$\left(-9x^4\right)\left(7x^5\right)$
$\lim_{x\to0}\frac{3\left(2\right)^x-1}{2}$
$-2x+4=x+1$
$2\sin\left(c\right)+\cos\left(c\right)^2=2$
$\frac{x^2+2x-5}{x+1}$
$\left(w-x\right)^2$
$\left(-4+10-6\right)\cdot\left(7-9\right)$
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