Its namesake law states "c squared equals a squared plus b squared minus 2ab" times this function applied to gamma.
This function's hyperbolic version is given by "e to the x plus e to the negative x, all over 2," which can be used to describe catenaries. The first two terms of its Taylor series are "1 minus x squared over 2," and the natural log of this function is found in the integral of the tangent. Its namesake law states "c squared equals a squared plus b squared minus 2ab" times this function applied to gamma. The dot product is defined in terms of, for 10 points, what trigonometric function that is the reciprocal of the secant, and is given by adjacent over hypotenuse.
This function's hyperbolic version is given by "e to the x plus e to the negative x, all over 2," which can be used to describe catenaries.
cosine