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12. Suppose that f is a differentiable function such that for all 2, xf(x) = 1 + sin 2x. Then fO)= A 3 BO © -5 © -2
4. If f(1) = arcsin(?), then f'() = ® © -1/2 2 ® undefined
12. Let S (x ) = (22 + 1)5/4(x3 +et)4 Vx1 + 2 Then f'(0) = A 2 B 275 32 © 272
