Clinician definition, a physician or other qualified person who is involved in the treatment and observation of living patients, as distinguished from one engaged in research. See more. Dictionary.com
In geometry, the foci (/ËfoÊsaÉª/ ; singular focus) are a pair of special points with reference to which any of a variety of curves is constructed. For example, foci can be used in defining conic sections, the four types of which are the circle, ellipse, parabola, and hyperbola. In addition, foci are used to define the Cassini oval and the Cartesian oval.
The primary trigonometric functions are the sine and cosine of an angle. These are sometimes abbreviated sin(Î¸) and cos(Î¸), respectively, where Î¸ is the angle, but the parentheses around the angle are often omitted, e.g., sin Î¸ and cos Î¸.