$\cos\:2\left(\theta\:\right)-2\cos\:\left(\theta\:\right)=-1;0^{\circ\:}\le\:\theta\:<\:180^{\circ\:}$
$-2\sin x=\tan x$
$2x^2-2\left(2x\right)\left(-1\right)+\left(-1\right)^2$
$144^2-b^2$
$\int x\cdot e^{-4t}dx$
$\left(2-3\right)^2+\left(2-3\right)^3$
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