$-x^2-4x+5>0$
$\cos\left(a-b\right)-\sin\left(a\right)\cdot\sin\left(b\right)$
$\frac{x}{x+1}+\frac{1}{x-1}$
$x^{\frac{1}{2}}\cdot x^{\frac{4}{5}}$
$\left(1-0.1\right)^{\frac{1}{2}}$
$f\left(x\right)=4x\left(x+3\right)+2x$
$\int\left(\frac{x+1}{4+x^2}\right)dx$
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