$\cos\left(x\right)=.2$
$\left(4a^x-5\right)\left(a^x+2\right)$
$\lim\:_{x\to\:0}\left(\frac{\sqrt{1+\sin\:\left(x\right)}-\sqrt{1-\sin\:\left(x\right)}}{x^2}\right)$
$6x^2+x-5x^2-7x$
$a=\left(2x\right)\cdot\left(x+2\right)$
$\sin\left(x-\pi\right)+\cos\left(2x\right)=0$
$\left(3x^2-2x+1\right)\cdot\left(-x^3+5\right)$
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