$\left(1-\cos\left(-t\right)\right)\left(1+\cos\left(t\right)\right)$
$\frac{1}{4}\left(\cos^2\frac{\pi}{12}-\sin^2\frac{\pi}{12}\right)$
$\left(9b+5x\right)\left(9b-5x\right)$
$-6yxy$
$m^2+3m+2.25$
$\frac{64a^3}{4a}+\frac{b^9}{b^3}$
$\frac{1}{e^y}dy=4e^xdx$
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