<prompt> Mstari mmoja umewekwa naanzapmatrix 2 - 3t -5 - 2t 1 - 6t mwishopmatrix.Mstari mwingine umeainishwa naanzapmatrix -frac32 s 2s -6 2s endpmatrix.Mistari miwili inakatiza kwa P. Ikiwa theta ni pembe kali inayoundwa na mistari miwili kwa P, kisha pata cos theta.  <response>: Vivekta vya mwelekeo wa mistari ni beginpmatrix -3 -2 -6 endpmatrix na beginpmatrix 1 2 2 endpmatrix. Cosine ya pembe kati yao ni basifracanzapmatrix -3 -2 -6 mwishopmatrix cdot anzapmatrix 1 2 2 mwishopmatrixleft anzapmatrix -3 -2 -6 mwishopmatrix kulia kushoto anzapmatrix 1 2 2 mwishopmatrix kulia frac-197 cdot 3 -frac1921.Tangu theta ni kali, cos theta frac1921. 