$a^2-4b\:=\:1$
$10\cdot30$
$2a^2b;\:a=2;\:b=3$
$25\left(\frac{60}{1}\right)$
$\lim_{x\to0}\left(\frac{8^t-5^t}{t}\right)$
$\int\left(\frac{sin^2x}{cosx}\right)dx$
$7\cdot7-\left(8-2\right)$
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