$4cos^2\left(\frac{7\pi}{4}\right)-3sin^2\left(\frac{7\pi\:}{4}\right)$
$-9+2\left(-x-16\right)$
$7+2\cdot\left(-5\right)$
$49x^1^6-16$
$\int\:\:x^2a^{2x}dx$
$\lim_{x\to2}\left(\frac{1}{x-2}-\frac{1}{log\left(x-1\right)}\right)$
$9a^2b-3xy-15a^2b+8xy-5a^2b+4xy$
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