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The arc tangent is the recicple of the tangent which is also known as the cotangent. The tangent of π/2 is undefined, thus the cotangent would be zero.

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Q: What is the arc tangent of pi over two?
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Related questions

What is Tan pi over 4?

tangent of pi/4 = 1


What is the measure if an arc that has 148 degrees tangent chord angle?

16*pi*r/45 where r is the radius.


What is inverse tangent?

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-pi/2 and pi/2


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