When a function finds itself stuck between a rock and a hard place, we use the Squeeze Theorem to work things out.  Most of the time, though, we can just plug things in.

Homework Q51

Indeterminate form fixed by canceling common factors.  Duration_2_14

Homework Q55

Indeterminate form fixed by multiplying by a conjugate.  Duration_3_31

Homework Q57

Indeterminate form fixed by getting a common denominator.  Duration_3_51

Homework Q61

Delta x? Duration_4_00

Homework Q69

Indeterminate form fixed by trig substitution.  Duration_2_35

Homework Q120

Indeterminate form fixed by trig substitution.  Duration_5_43