That would be an isosceles right triangle with sides of 1, 1, and the square root of 2. 1/1=1.
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tan 45° = 1
45 degrees
Let's look at an right isosceles triangle (where the base angles measure 45 degrees, and legs are congruent). So that, tan 45 degrees = leg/leg = 1
1
0 is your answer tan(45)=1 and arccos(1)=0