$16-104a^2+169a^4$
$3x^2+12x+3$
$\log_{x+3}\left(x-3\right)^2=2$
$\sqrt{y}dx+\left(x^2+4\right)dy=0$
$\cot\frac{x}{2}=1$
$f\left(x\right)=\frac{6}{7-1}$
$\frac{6x^2y+2y^3}{3yx^2+y^3}$
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