$\log\left(x+1\right)=1-\log\left(x-1\right)$
$a^{4+2a^2+9}$
$\int\left(\frac{4x+1}{x^2+9}\right)dx$
$\frac{x+4}{x^2+8x+12}$
$\frac{2x^4-3x^2-5x-6}{x+3}$
$100-49^2$
$3+4^2\cdot3-\sqrt{36}+15^0$
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