Broken Link in Chapter 5.4

[phattymcfee]

Please check the current issues Many bug reports are duplicates, this just creates more work for us. Searching the issues first may give you your answer or a workaround! If not adding new information to an existing report is much more helpful than a new report.

What Course are you in
Knowing the course will help us a lot
thinkcspy
What Page were you on

What is your username
phattymcfee
Describe the bug
Clicking on the link "Sine Wave" in Section 5.4.1 lab results in an error

Traceback
If you got here through the Bug Report page and there was a stack trace, please paste it here

Javascript Errors
Many many errors can be quickly diagnosed from the Javascript Console error log. On Chrome this is View --> Developer --> Javascript Console, on Safari ⌥⌘i or Develop --> Show Web Inspector on Firefox Tools --> Web Developer --> Toggle Tools