Escitalopram is an oral drug that is used for treating depression and generalized anxiety disorder. Chemically, escitalopram is similar to citalopram . Both are in a class of drugs called selective serotonin reuptake inhibitors (SSRIs), a class that also includes fluoxetine , paroxetine and sertraline .
1 A circle is all of the points that are a fixed distance, known as the radius, from a given point, known as the center of the circle. 2  Explore the standard equation of a circle using the applet below (Go here for a larger version).
Know what the unit circle is. The unit circle is a circle, centered at the origin, with a radius of 1. Recall from conics that the equation is x 2 +y 2 =1.This circle can be used to find certain special trigonometric ratios as well as aid in graphing.ecall that there is a real number line wrapped around the unit circle. The point on the number line refers to the number of radians in the angle formed. For instance The point at Ï/2 on the real number line corresponds with the point on the circle whose radius forms an angle of Ï/2 with the positive horizontal radius.