$5y+5z+1b-7y-5z+3b$
$cos\frac{1}{2}x=-\frac{\sqrt{3}}{2}$
$+1a^2-3a+3a-9$
$\lim_{x\to0}\left(\frac{sin\left(9x\right)}{3x}\right)$
$-25\cdot7$
$\int_0^2x^{-3}dx$
$y=\frac{2\theta\:^4sin\theta\:\:}{3\sqrt{sec\theta\:\:}}$
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