Add units and use built-in $PI.
Added solutions (adapted from eliminated duplicate problems)
Make sure the function is not constant.
Added clarification:  sides --> sides of the base
Added link for interval notation.
Remove fraction context
Fixed bug 3232, latex error.
Formatting change
Setting context for different types of answers
Set domain inside custom answer checker
Correct typo in inner product.
Fix typo in $D[2]
Fix bug 3236 (local reference)
Fixed broken link
Miscategorized.
Correct basis vectors used in calculation.
Slight coding improvement
Improve typesetting.
Correct domain for log function in answer.
Update to avoid numerically unstable answer checking.