<prompt> Tafuta pembe kati ya vekta anzapmatrix 2 -1 1 mwishopmatrix na anzapmatrix -1 1 0 endpmatrix, kwa digrii .  <response>: Ikiwa theta ni pembe kati ya vekta, basicos theta fracanzapmatrix 2 -1 1 mwishopmatrix cdoti anzapmatrix -1 1 0 mwishopmatrix kushoto anzapmatrix 2 -1 1 mwishopmatrix kulia kushoto anzapmatrix -1 1 0 mwishopmatrix kulia frac2-1 -11 10 sqrt6 cdot sqrt2 frac-32 sqrt3 -fracsqrt32.Kwa hiyo, theta 150circ. 