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# In mathematics, trigonometry, also called triangulation, is a branch of mathematics that studies relationships involving lengths and angles of triangles. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies. Trigonometry is also the foundation of surveying.

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University of Texas at Austin

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value of sign of negative three pi over two radiance. So in order to do this, we need to find what that co terminal angle would be a three negative three pi over two. So we're gonna do that by adding negative three pie over two plus two pi. We're gonna go ahead and put that over one, because we're gonna have to find a common denominator. So that will be negative. Three pie over two because their common denominator will be too. Plus four pi over two. I'll add enumerators. So negative three pi plus four pi would give me pie over to. So the code terminal angle of negative three pi over two is pi over two. So we're gonna find the sign off pi over two, which would be our answer for sign of negative three pi over two. So when I come over here and look, that's going to be right here at 90 degrees and because we're looking for our sign, our sign is R y value. So that is going to equal a positive one

Liberty University

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##### Lily A.

Johns Hopkins University

##### Alisa L.

University of Texas at Austin

AH
##### Ahyeon H.

University of California, Berkeley

##### Martha R.

Michigan State University