$\frac{1}{25}x^6+9x^2y^2-\frac{6}{5}x^4y$
$\sqrt[4]{81x^5}5^8$
$\lim_{x\to3}\left(\frac{2x^2+\:12x+18}{x^2+\:x-6}\right)$
$\frac{sinx}{secxtanx}$
$\lim_{x\to1.5}\left(\frac{2x-3}{6x^2-13x+6}\right)$
$4x+15=r$
$x-\sqrt{4x^2-3}=3-x$
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