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Thomas Calculus 13th [Solutions]

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Section 3.1 Tangents and the Derivative at a Point 119<br />

41. (a) The graph appears to have a vertical tangent<br />

at x 0.<br />

(0 ) (0)<br />

(b) lim f h f lim h<br />

1/5 0 lim 1<br />

h 0<br />

h<br />

h 0<br />

h<br />

4/5<br />

h 0 h<br />

42. (a) The graph appears to have a vertical tangent<br />

at x 0.<br />

1/5<br />

y x has a vertical tangent at x 0.<br />

(b)<br />

3/5<br />

f (0 h) f (0) h 0<br />

lim lim lim 1<br />

h 0<br />

h<br />

h 0<br />

h<br />

h 0 h<br />

2 5<br />

the graph of<br />

3/5<br />

y x has a vertical tangent at x 0.<br />

43. (a) The graph appears to have a cusp at x 0.<br />

(b)<br />

lim f (0 h) f (0) lim 2/5<br />

4h 2h<br />

lim 4 2 and lim 4 2<br />

h h 3/5<br />

3/5<br />

h 0 h 0 h 0 h<br />

h 0 h<br />

2/5<br />

the graph of y 4x 2x does not have a vertical tangent at x 0.<br />

limit does not exist<br />

44. (a) The graph appears to have a cusp at x 0.<br />

(b)<br />

f (0 h) f (0) 5/3 2/3<br />

5 2/3<br />

lim lim h h lim 5 0 lim 5<br />

1/3 1/3<br />

0<br />

h<br />

0<br />

h h does not exist the graph of<br />

h h h 0 h h 0 h<br />

5/3 2/3<br />

y x 5x does not have a vertical tangent at x 0.<br />

Copyright<br />

2014 Pearson Education, Inc.

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