Question

Can anyone tell me what arctan(1/2) (in radians or degrees), with no approximations?

Answer 1

Assuming that you mean a decimal or rational expression, I think the answer is no.

Explanation:

`arctan(0.5)` is not a rational multiple of `pi`. (See the discussion here: http://math.stackexchange.com/questions/79861/arctan2-a-rational-multiple-of-pi )

Furthermore, I do not believe that `arctan(0.5)` is rational in radians or degrees.

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