Find grad f. Graph some level curves f = const. Indicate Vf by arrows at some...

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Find grad f. Graph some level curves f = const. Indicate Vf by arrows at some points of these curves. 1. f = (x + 1)(2y – 1) 2. f = 9x2 + 4y2 3. f = y/x 4. (y + 6)2 + (xr – 4)2 5. f = x* + y* 6. f = (x2 - y?)/(x² + y?) ,4 Find grad f. Graph some level curves f = const. Indicate Vf by arrows at some points of these curves. 1. f = (x + 1)(2y – 1) 2. f = 9x2 + 4y2 3. f = y/x 4. (y + 6)2 + (xr – 4)2 5. f = x* + y* 6. f = (x2 - y?)/(x² + y?) ,4