$\left(5a+10\right)\left(5a-10b\right)$
$\left(\frac{1}{4}-3x^2\right)\left(\frac{1}{4}+3x^2\right)$
$\frac{\left(\sin\left(x\right)+\cos\left(x\right)\right)\left(\sin\left(x\right)-\cos\left(x\right)\right)}{\cos^2\left(x\right)}$
$-15+5+-80+-25$
$-3a+4b-6a+81b-19b-2b+8a-3b+5a$
$a\left(a^{x+1}-2b^{x-1}\right)\left(2b^{x-1}+a^{x+1}\right)$
$\int\frac{1}{\left(-5-6x-x^2\right)^{\frac{5}{2}}}dx$
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