dy for 2xy = dr 4 cos(x) – y?." as Problem 18: A student answers a homework question "Find follows. Identify and explain the four mistakes they make in their work: d d (2.ry) dx (4 cos(x) – y²) d.x dy dy + 2.x = 4 sin(ax) – 2y- 2.x dx dy dy 2x 4 sin(æ) – 2y + 2x d.x

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