roznica-cos2165circ-sin2165circ-jest-rowna

$-1$-1

$\displaystyle - \frac{\sqrt{3}}{2}$\displaystyle - \frac{\sqrt{3}}{2}

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

$\displaystyle \frac{\sqrt{3}}{2}$\displaystyle \frac{\sqrt{3}}{2}