$4\cos\theta=1+2\cos\theta$
$2\log_{13}\left(x+1\right)=\log_{13}\left(2x+8\right)$
$\lim_{x\to0}\left(\frac{sin7x}{xcosx}\right)$
$\int\left(x^2+2x+3\right)e^xdx$
$\left(3x^3+4y^2\right)^2$
$-5a+b\:\:-7a+5$
$\sqrt{64a^3}$
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