$5a^2-21a+4$
$\frac{d}{dx}\frac{3}{5}\sin\left(8x\right)$
$\frac{sin2x}{sin^2x}$
$\lim_{x\to\infty}\left(\frac{6x^2-x+2}{3x^2-3x+1}\right)$
$\left(\frac{cotx}{sinx}+\frac{sinx}{cosx}\right)cosx$
$+5+\left(-\left(-2\right)\right)-\left(-10\right)$
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