That's a very bad question. It's asking you to utilise a technique/method outside the method's normal limits of use.
A 1:60 calculation is subject to a rapid increase in error as the TE or CA increases. This is normally controlled within reasonable limits by NOT using the method to calculate an angle when that angle (eg TE or CA) is greater than about 15 deg.
So, a reasonable magnitude of error in this questions for the TE, but outside any reasonable magnitude of error for the CA.
Hence poor question design.
[This message has been edited by Tinstaafl (edited 20 June 2001).]