$sin\left(30\right)\:^2$
$\lim\:_{x\to\:\:0}\left(\frac{2x^4-7x^2-6x}{8x^4+3x}\right)$
$\left(\:-10\:-\:-20\right)\:.\:30$
$\sec x\left(-\cot\left(x\right)\csc\left(x\right)\right)$
$\frac{x^3-43x+42}{x+7}$
$9x^2-18x+10=0$
$\frac{2\pi^x-2}{\pi^{3x}-1}$
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