$45\cdot\left(-10\right)$
$2+\left(-2\right)-\left(13-4\right)+9$
$3x^2-6x-72$
$\left(a^4-10\right)\left(a^4+5\right)$
$\frac{\left(n-1\right)\left(x+3\right)^{n+3}}{n\left(n^2+1\right)}$
$2^2+6\cdot\left(2\right)+2$
$f\left(x\right)=\left(x^2+3x\right)\left(4x^3-6x\right)$
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