<prompt> Rahisishacos kushoto frac2 pi15 kulia cos kushoto frac 4 pi15 kulia cos kushoto frac8 pi 15 kulia cos kushoto frac 16 pi15 kulia.  <response>: Acha x cos left frac2 pi15 kulia cos kushoto frac 4 pi15 kulia cos left frac8 pi15 kulia cos left frac 16 pi15 kulia. Kisha kwa kutumia tena fomula ya pembe mbili,anzaalignx dhambi kushoto frac2 pi15 kulia dhambi kushoto frac2 pi15 kulia cos kushoto frac2 pi 15 kulia cos kushoto frac 4 pi15 kulia cos kushoto frac8 pi15 kulia cos kushoto frac 16 pi15 kulia frac12 sin kushoto frac4 pi15 kulia cos kushoto frac 4 pi15 kulia cos kushoto frac8 pi15 kulia cos kushoto frac 16 pi15 kulia frac14 sin kushoto frac 8 pi15 kulia cos kushoto frac8 pi15 kulia cos kushoto frac 16 pi15 kulia frac18 sin kushoto frac16 pi15 kulia cos kushoto frac 16 pi15 kulia frac116 sin kushoto frac32 pi15 kulia frac116 sin kushoto frac2 pi15 kulia,endalignhivyo x frac116. 