Quiz #2 Solutions

Tom Morley
Math1501
9/9/99

Problem 1

Part a)

[Graphics:indexgr2.gif][Graphics:indexgr1.gif]
[Graphics:indexgr2.gif][Graphics:indexgr3.gif]
[Graphics:indexgr2.gif][Graphics:indexgr4.gif]

Sx Sin[1/x] is caught between x and -x. By the Flyswatter principle,
the limit as x--> is 0.

[Graphics:indexgr2.gif][Graphics:indexgr5.gif]
[Graphics:indexgr2.gif][Graphics:indexgr6.gif]

Part b)

[Graphics:indexgr2.gif][Graphics:indexgr7.gif]
[Graphics:indexgr2.gif][Graphics:indexgr8.gif]

⁃Graphics⁃

The function blows up and occilates infinitely often. No limit.

Part c)

[Graphics:indexgr2.gif][Graphics:indexgr9.gif]
[Graphics:indexgr2.gif][Graphics:indexgr10.gif]
[Graphics:indexgr2.gif][Graphics:indexgr11.gif]

As x--> 0, the limits along irrations x and along rational x are the same,p namely zero
Limit is therefore zero.

[Graphics:indexgr2.gif][Graphics:indexgr12.gif]
[Graphics:indexgr2.gif][Graphics:indexgr13.gif]

[Graphics:indexgr2.gif][Graphics:indexgr14.gif]
[Graphics:indexgr2.gif][Graphics:indexgr15.gif]

[Graphics:indexgr2.gif][Graphics:indexgr16.gif]

Part d)

[Graphics:indexgr2.gif][Graphics:indexgr17.gif]
[Graphics:indexgr2.gif][Graphics:indexgr18.gif]
[Graphics:indexgr2.gif][Graphics:indexgr19.gif]

At x = &pgr; the limits are different

[Graphics:indexgr2.gif][Graphics:indexgr20.gif]
[Graphics:indexgr2.gif][Graphics:indexgr21.gif]

[Graphics:indexgr2.gif][Graphics:indexgr22.gif]
[Graphics:indexgr2.gif][Graphics:indexgr23.gif]

Problem 2

[Graphics:indexgr2.gif][Graphics:indexgr24.gif]
[Graphics:indexgr2.gif][Graphics:indexgr25.gif]
[Graphics:indexgr2.gif][Graphics:indexgr26.gif]

[Graphics:indexgr2.gif][Graphics:indexgr27.gif]
[Graphics:indexgr2.gif][Graphics:indexgr28.gif]
[Graphics:indexgr2.gif][Graphics:indexgr29.gif]

Left limit is 4, Right limit if 3

Problem 3

Part a)

[Graphics:indexgr2.gif][Graphics:indexgr30.gif]
[Graphics:indexgr2.gif][Graphics:indexgr31.gif]
[Graphics:indexgr2.gif][Graphics:indexgr32.gif]

[Graphics:indexgr2.gif][Graphics:indexgr33.gif]
[Graphics:indexgr2.gif][Graphics:indexgr34.gif]

Limit does not exist (Infinity is not a real number)

Part b)

[Graphics:indexgr2.gif][Graphics:indexgr35.gif]
[Graphics:indexgr2.gif][Graphics:indexgr36.gif]
[Graphics:indexgr2.gif][Graphics:indexgr37.gif]

[Graphics:indexgr2.gif][Graphics:indexgr38.gif]
[Graphics:indexgr2.gif][Graphics:indexgr39.gif]

Part c)

[Graphics:indexgr2.gif][Graphics:indexgr40.gif]
[Graphics:indexgr2.gif][Graphics:indexgr41.gif]
[Graphics:indexgr2.gif][Graphics:indexgr42.gif]

[Graphics:indexgr2.gif][Graphics:indexgr43.gif]
[Graphics:indexgr2.gif][Graphics:indexgr44.gif]

This can be seen as [Graphics:indexgr45.gif] = [Graphics:indexgr46.gif]( Cos[x] -1)

Part d)

[Graphics:indexgr2.gif][Graphics:indexgr47.gif]
[Graphics:indexgr2.gif][Graphics:indexgr48.gif]
[Graphics:indexgr2.gif][Graphics:indexgr49.gif]

[Graphics:indexgr2.gif][Graphics:indexgr50.gif]
[Graphics:indexgr2.gif][Graphics:indexgr51.gif]