What is the arctangent of 1?

arctan 1 = ?

The arctangent is the inverse tangent function.

Since

tan π/4 = tan 45º = 1

The arctangent of 1 is equal to the inverse tangent function of 1, which is equal to π/4 radians or 45 degrees:

arctan 1 = tan-1 1 = π/4 rad = 45º

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