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(10 pts) Let f(x, y) = sin(x2 + y2). (a) (5 pts) Find the range of f(x, y). Fully justify your answer. (b) (5 pts)

(10 pts) Let f(x, y) = sin(x2 + y2). (a) (5 pts) Find the range of f(x, y). Fully justify your answer. (b) (5 pts) Describe the level curve of f(x, y) with value k = 0

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