<prompt> Sehemu ina viwianishi vya mstatili 8,-3,-1 na viwianishi vya duara rho, theta, phi. Tafuta viwianishi vya mstatili vya nukta na viwianishi vya duara rho, -theta , phi.  <response>: Tuna hiyoanzaalign8 rho sin phi cos theta, -3 rho dhambi phi dhambi theta, -1 rho cos phi.mwishoalignKishaanzaalignrho sin phi cos -theta rho sin phi cos theta 8, rho dhambi phi dhambi -theta -rho sin phi sin theta 3, rho cos phi -1,endalignili viwianishi vya mstatili ni 8,3,-1. 