$sec\:x\:\left(cotx+secx\right)$
$20\cos^2\left(x\right)=17.5\sin\left(2x\right)$
$84ab^4c^3-60a^4bc^2$
$\frac{y}{2}+7+4+4+7$
$\left(11a\:+\:5b\right)\left(11a\:-\:5b\right)$
$\left(5\:m^2\:+6\right)\left(5\:m^2\:-5\right)$
$4ab^{2}c:2a$
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