41. f(x, у, г) — ху + уz + xz at а. (1, 1, 1) b. (1, 0, 0) с. (0, 0, 0) 42. f(x, у, г) %— х? + у? + 2? at а. (1,1, 1) b. (0, 1, 0) с. (1,0, 0) 43. f(x, у, 2) 3 Vx? + y? + z? at а. (1, 0, 0) b. (1, 1, 0) с. (1, 2, 2) 44. f(x, у, г) %3D (sin xy)/z at а. (т/2, 1, 1) b. (2, 0, 1) 45. f(x, y, z) = e* + cos (y + z) at A (a 5.0) - (a) а. (0, 0, 0) b. (0, с. 46. f(x, y, г) 3D tan (хуг) at а. (1,0, 0) b. (1, 1, 0) с. (1, 1, 1)

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