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# In mathematics, the cosine function is a trigonometric function that measures an angle's size in degrees. The term "cosine" comes from the Latin word cosinus, which means "the adjacent side". The cosine of an angle is denoted by the symbol or cos. In terms of the standard unit circle, the cosine can be defined as the ratio of the adjacent leg to the hypotenuse of a right triangle, or the ratio of the adjacent side to the hypotenuse.

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postseason function. Now we practice sine function, and a cosign function is done very similar to a sine function. Um, we're gonna start off the same way. First thing we're gonna do is we're gonna find the X intercept. Now, when you're talking about cosign, you're actually gonna be looking, um, a little differently because now what you're gonna be looking at is you're gonna be looking at that 90 degrees in to 70 degrees. So when you're looking at, you want to see where the cosign is Zero. Because remember that Kasan is your ex over our So you wanna get that tow where your ex is actually going to be zero over our. So the two points that that happens at is means it's gonna be basically you're looking at the y intercept. So those two points are gonna be at 0 90 they're gonna be at nine degree angles and at 270 degree angle. So what you're looking at is you've got a 90 zero and 2 70 zero. So those were gonna be my ex intercepts. From there, I'm gonna look at my maximum and minimum again. This is where you want to get again. Remember, Cosign, you're looking at a X over our. So you want to see where the maximum is one or the minimum would be negative one. Well, it's that positive one at zero degrees and at 360 degrees. Is that negative? One at 180 degrees. So, at this point, that means that right there is gonna be my each unit on this, uh, coordinate. Griffin is gonna be 1/4 so that's gonna be one. There's my minimum. And here is my maximum. So a co sign graph is gonna look similar to this right here. And the pattern would actually just keep going, so it would continue those lips. Liberty University

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##### Top Algebra 2 Educators ##### Alisa L.

University of Texas at Austin  ##### Heather Z.

Oregon State University ##### Kristen K.

University of Michigan - Ann Arbor