$81-9^2$
$\frac{2x^2+4x+6}{\left(2x+3\right)\left(2x+2\right)}=\frac{17}{35}$
$\lim_{x\to0}\left(\frac{5^x}{5^n+7^n}\right)$
$\left(4y^2+z^3\right)^2$
$\left(-a^{x+1}b^{x+3}\right)\left(a^{x+2}b^x\right)$
$\int\left(\frac{t^5}{\sqrt{t^2+7}}\right)dx$
$3\log_b\left(5\right)$
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