dana-jest-funkcja-okreslona-wzorem-begincases-displaystyle-x2-1andamptextdla-xinleft-infty-2right-2x1andamptextdla

$1$1

$\displaystyle \frac{1}{2}$\displaystyle \frac{1}{2}

$\displaystyle - \frac{1}{2}$\displaystyle - \frac{1}{2}

$-1$-1