Typo fix, Chebyshev recurrence relation

[johnfgibson]

Changed T_n{x} to T_n(x)

[codecov[bot]]

Codecov Report

Base: 83.12% // Head: 83.12% // No change to project coverage :thumbsup:

Coverage data is based on head (d3f8576) compared to base (63b756b). Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #448   +/-   ##
=======================================
  Coverage   83.12%   83.12%           
=======================================
  Files          22       22           
  Lines        2987     2987           
=======================================
  Hits         2483     2483           
  Misses        504      504           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

:umbrella: View full report at Codecov.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.

[jverzani]

Sorry this took so long to merge, somehow I missed it. Thanks!