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101y99fin

# 101y99fin - B U Department of Mathematics Math 101 Calculus...

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B U Department of Mathematics Math 101 Calculus I Summer 1999 Final Exam Calculus archive is a property of Bo˘ gazi¸ ci University Mathematics Department. The purpose of this archive is to organise and centralise the distribution of the exam questions and their solutions. This archive is a non-profit service and it must remain so. Do not let anyone sell and do not buy this archive, or any portion of it. Reproduction or distribution of this archive, or any portion of it, without non-profit purpose may result in severe civil and criminal penalties. 1. Using the definition of the derivative evaluate f (0) if f ( x ) = xe - 1 /x 2 if x = 0 0 if x = 0 Solution: f (0) = lim h 0 f (0 + h ) - f (0) h = lim h 0 he - 1 /h 2 - 0 h = lim h 0 1 e 1 /h 2 = 0 2. Let f : R R be a function such that, for all x, y R f ( x + y ) = f ( x ) + f ( y ) . a) Show that f (0) = 0. b) Show that if f is continuous at 0, then f must be continuous at every x in R . Solution: a) f (0) = f (0 + 0) = f (0) + f (0) f (0) = f (0) - f (0) = 0 .

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