H 2, the cosine of the acute angle between the surfaces + y+ z- 9 0 and z -x- y+3 = 0 at the point (2. 1, 2) is: 10 (8) 521 ) 52 10 d) 321 c) 321

h 2, the cosine of the acute angle between the surfaces + y+ z- 9 0 and z -x- y+3 = 0 at the point (2. 1, 2) is: 10 (8) 521 ) 52 10 D) 321 C) 321