<prompt> Tafuta pembe kati ya vekta anzapmatrix 4 4 7 endpmatrix na anzapmatrix 1 4 1 endpmatrix, kwa digrii.  <response>: Ikiwa theta ni pembe kati ya vekta, basicos theta fracanzapmatrix 4 4 7 mwishopmatrix cdot anzapmatrix 1 4 1 mwishopmatrixkushoto anzapmatrix 4 4 7 mwishopmatrix kulia kushoto anzapmatrix 1 4 1 mwishopmatrix kulia frac41 44 719 cdot sqrt18 frac2727 sqrt2 frac1sqrt2.Kwa hiyo, theta 45circ. 