MATH 41 Final: Stanford MATH 41 11finalsol

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Solutions to math 41 final exam december 12, 2011: (10 points) find each of the following limits, with justi cation. If there is an in nite limit, then explain whether it is or . x(cid:19)1/ ln(x) (a) x (cid:18) 1 lim (5 points) first we compute the limit: lim x ln"(cid:18) 1 x(cid:19)1/ ln(x)# = lim x . Now since f (x) = ex = exp(x) is a continuous function, we compute lim x (cid:18) 1 x(cid:19)1/ ln(x) = lim x exp"ln (cid:18) 1 ln (cid:18) 1 x(cid:19)1/ ln(x)!# x(cid:19)1/ ln(x)!# x . Therefore the given limit has form constant over 0, and so it involves in nity. Because we are taking absolute values, the limit must be positive in nity: lim x 3+(cid:12)(cid:12)(cid:12)(cid:12) x2 6x + 10 x2 4x + 3 (cid:12)(cid:12)(cid:12)(cid:12) Page 2 of 15: (12 points) in each part below, use the method of your choice (that works) to nd the derivative.

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