Question: 4. Find all the errors below and explain why they are incorrect. 13 a) (x + 1)2 = 1 x2 + 2x +1 = 3

4. Find all the errors below and explain why they are incorrect. 13 a) (x + 1)2 = 1 x2 + 2x +1 = 3 +xz+x 0 b) sin x cos x dx = sin x dx . cos x dx = - cos x sin x

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