$\cos\left(\pi-3a\right)$
$\frac{d}{dx}\frac{7x^6}{5y^4}$
$7+5inx=8$
$4\cos^26x-2=0$
$\frac{x^4+2x^3-10x}{x-3}$
$\frac{1}{2}\cos\left(5x\right)^4$
$\lim_{x\to2}\left(\ln\left(x+z\right)\right)$
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