$\left[\left(x-3y\right)+4\right]\left[\left(x-3y\right)-4\right]$
$686x^7-1024x^4$
$log_b\frac{2}{3}$
$\left(1-2^a\right)^3$
$\frac{\sin^2x-\cos^2x}{1-\cot^2x}$
$y^2-16y-64$
$\frac{\left(6x^5-5x^3+2x^2-3x+2\right)}{\left(2x^2+1\right)}$
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