$a^2-a^4+a^6-a^8$
$-8y+3-7y+14$
$x^2-30x+225=441$
$90\sqrt{4}-5\sqrt{25}$
$3ln\:2x+ln\:4x$
$\frac{\left(x+2\right)}{\left(x+7\right)\left(x-9\right)}$
$\int\frac{4e^{2x}}{e^{2x}+12e^x+32}dx$
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