$sin^2x=0.8$
$-\cos^2x+2\sin x+2$
$y''-25y=0$
$\frac{d}{dx}\left(\frac{\:x}{x^2-1\:}\right)$
$\sec\left(330-3a-6b\right)$
$\lim_{x\to0}\left(\frac{\sin\left(x\right)}{3\cot x}\right)$
$6mn-8mn+mn-7mn$
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