$\left(4y\:+\:9x\right)\:\left(4y\:-\:9x\right)$
$a^2+8+16$
$3^x+3^{2x}=3^{3x}$
$\frac{5x-1}{5x^2+17x+6}$
$\lim_{x\to-2}\left(x^3-2x^2+4x+8\right)$
$\lim_{x\to\infty}\left(\frac{cos^2\left(x-1\right)}{3xsin\left(2x\right)}\right)$
$x^6+64y^6$
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