$\frac{4x^4-3x^3-2+4}{5x-6}$
$\frac{x-1}{x+1}\le2$
$\cot\left(2x\right)=0.25$
$cos^2x\left(1-sec^2x\right)$
$\frac{x^2+2x-3}{x^2+8x+16}\cdot\frac{3x+12}{x-1}$
$\frac{5a^2b}{10ab^2}$
$\frac{dy}{dx}-7cos\left(x-y\right)=0$
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