$-7\:+\:9\:\cdot\:-3\:+\:15$
$\:\left(2xy\right)^{-2}\left(xy6\right)$
$\frac{\sin\left(x\right)}{1+\cos\left(x\right)}=2$
$f+5f$
$11\left(12\right)\:$
$3\sec^3\left(x\right)-3\sec^2\left(x\right)-\sec\left(x\right)+3$
$40\cdot89$
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