<prompt> Kokotaanzavmatrix 1 cos a - b cos a cosa - b 1 cos b cos a cos b 1 mwishovmatrix .  <response>: Tunaweza kupanua kibainishi kama ifuatavyo:anzaalignanzavmatrix 1 cos a - b cos a cosa - b 1 cos b cos a cos b 1 mwishovmatrix anzavmatrix 1 cos b cos b 1 mwishovmatrix - cos a - b anzavmatrix cos a - b cos b cos a 1 mwishovmatrix cos a anzavmatrix cos a - b 1 cos a cos b endvmatrix 1 - cos2 b - cos a - bcos a - b - cos a cos b cos a cos a - b cos b - cos a 1 - cos2 b - cos2 a - b cos a cos b cosa - b cos a cos b cos a - b - cos 2 a 1 - cos2 a - cos2 b - cos2 a - b 2 cos a cos b cosa - b.endalignTunaweza kuandikaanzaalign2 cos a cos b cos a - b - cos2 a - b cos a - b 2 cos a cos b - cos a - b cos a - b cos a cos b - sin a dhambi b cos a - b cos a b frac12 cos 2a cos 2b cos2 a - frac12 cos2 b - frac12 cos2 a cos2 b - 1.endalignKwa hivyo, kibainishi ni sawa na 0. 