$2\cdot\left(\sin\left(x\right)+\cos\left(x\right)\right)\left(\cos\left(x\right)-\sin\left(x\right)\right)$
$15\:+\:\left(6\:-\:18\:+\:11\right)\:-\:\left(7\:+\:15\:-\:19\right)\:+\:\left(1\:-\:3\:-\:6\right)$
$-6\::\:-4$
$3a^2\:x\:-\:3b^2\:x\:+\:3a^2\:-\:3b^2\:$
$\frac{1}{x-1}-\frac{1}{x}$
$5a\:+\:10b\:-\:4a\:-\:7b$
$\int_0^{2\pi}\left(sin\left(x\right)\right)dx$
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