題組內容
7. (10 points)
Let f(x, y) = x² + x cos y be a surface.
(b) Is the gradient
normal to the level curve f(x, y) = 1? Please show your answer. (5 points)
阿摩線上測驗
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(b) Is the gradientnormal to the level curve f(x, y) = 1? Please show your answer. (5 points)