$\sec^2\left(x\right)-2\tan^2\left(x\right)=-2$
$\left(7\cdot10^8\right)\left(9\cdot10^6\right)$
$\frac{c}{c^8}$
$xe^{-1}$
$-324\:\cdot\:24$
$sin2\left(x\right)cos\left(x\right)-sin\left(x\right)cos2\left(x\right)$
$\left(x-10\right)\left(x-15\right)$
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