kat-alphainleft0circ-180circ-right-oraz-wiadomo-ze-displaystyle-sinalpha-cdot-2

$\displaystyle \frac{15}{4}$\displaystyle \frac{15}{4}

$\displaystyle \frac{9}{4}$\displaystyle \frac{9}{4}

$\displaystyle \frac{27}{8}$\displaystyle \frac{27}{8}

$\displaystyle \frac{21}{8}$\displaystyle \frac{21}{8}