$\frac{6\cdot z}{5}\cdot\frac{9\cdot z}{5}$
$9^{-n}=9^{3n}$
$2m^{2\:}+3m-4$
$\log\left(8x+4\right)+\log\left(7x+16\right)$
$cos^2x\left(-2sin\left(2x\right)\right)-\left(-sin\left(2x\right)\right)\left(1+cos\left(2x\right)\right)$
$\int30sec^2xdx$
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