$1-\cos\left(x\right)=\sin^2\left(x\right)$
$\left(x-3\right)\left(x-1\right)-8$
$\cos\left(x\right)\cdot\sin\left(x\right)=\frac{\sin\left(2x\right)}{2}$
$2x^2+4x+5$
$7,93\cdot1$
$\lim\:_{x\to\:3}\left(\frac{x^2+27}{4x+24}\right)$
$3n-6n+2n$
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