$\left(8y-9x\right)\left(8y+9x\right)$
$\lim_{x\to\infty}\left(\frac{3x+5}{3x-2}\right)^{6x-1}$
$\lim_{x\to\infty}\left(\frac{ln\left(x^7\right)}{9x}\right)$
$-7a=-10-9a$
$\frac{dy}{dx}\left(4x\right)^{x+9}$
$15\cos^2x+\cos x=6$
$\frac{10}{2}+20+3$
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