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/ / ∂Q ⎛⎜ z 2 − y 2 ⎞⎟ =⎜ ∂x ⎝ ⎟ = z(2 − y ⋅) 2 ⎛1⎞ ⎜ ⎟ = − z2 − y2 2 ⇒ ⎛ ∂Q ⎞ ⎜ ∂ ⎟ = −5 . x ⎠x ⎝ x ⎠ x x ⎝ x ⎠B r r r i j k ∂ ∂ r ∂ ∂ r ∂ ∂ r ∂ ∂ ∂ r rotF = = i ⋅ ∂y ∂z − j ⋅ ∂x ∂z + k ⋅ ∂x ∂y = ∂x ∂y ∂z P R Q R P Q P Q R r ⎛ ⎛ ∂R ⎞ ⎛ ∂Q ⎞ ⎞⎟ r ⎛ ⎛ ∂R ⎞ ⎛ ∂P ⎞ ⎞⎟ r ⎛⎜ ⎛ ∂Q ⎞ ⎛ ∂P ⎞ ⎞ ⎜ ⎜ =i ⋅ ⎜ ⎟ −⎜ ⎟ ⎟ ⎜ − j ⋅ ⎜⎜ ⎟ − ⎜ ⎟ ⎟ + k ⋅ ⎜ ⎟ − ⎜⎜ ⎟⎟ ⎟ = ⎜ ⎝ ∂y ⎠ ⎝ ∂z ⎠ B ⎟⎠ ⎜ ⎝ ∂x ⎠ ⎝ ∂y ⎠ B ⎟⎠ ⎝ B ⎝ ⎝ ∂x ⎠ B ⎝ ∂z ⎠ B ⎠ ⎝ B r r ⎛ 7⎞ r r r 13 r = (0 + 6) ⋅ i − (0 + 3) ⋅ j + ⎜ − 5 + ⎟ ⋅ k = 6i − 3 j − k . ⎝ 4⎠ 4 46
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