MATH 140 Midterm: MATH140H BOYLE-M FALL2004 0101 MID SOL
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No books, no notes, no calculators: (a) (5 points) suppose a and l are real numbers and f is a function de ned on an open interval containing a. Let = min{1, /8}; that is, is the smaller of the two numbers. 1 and /8. (note that |x 3| < 1 means 2 < x < 4. ) 0 < |x 3| < = |(x2 + x) 12| < |4 + 4| (because 2 < x < 4, we have |x + 4| < 8) < 8 8( /8) = . (30 points) evaluate each of the following. 2. number, + , , or does not exist . No proof required. (a) lim x 0 (b) lim x e sin(5x) sin(7x) ln(ln(x)) ln(x)) 7 (c) lim x /2+ sec(x) = + (d) lim x 0 x sin(1/x) = 0 . (for all x, |x| sin(1/x) |x|.