SOLUTION: is arctan(tan sqrt5) undefined? theta of sqrt5 is less than pi/2 so it should work?

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Question 1033150: is arctan(tan sqrt5) undefined? theta of sqrt5 is less than pi/2 so it should work?
Found 2 solutions by Fombitz, ikleyn:
Answer by Fombitz(32388) About Me  (Show Source):
Answer by ikleyn(52908) About Me  (Show Source):
You can put this solution on YOUR website!
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is arctan(tan sqrt5) undefined? theta of sqrt5 is less than pi/2 so it should work?
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"arctan(tan sqrt5)" is BAD writing and probably is an error.

The correct writing is "arctan(sqrt(5))" . . .