There are two fundamental trigonometric functions: sine and cosine, and four co-fundamental functions: tangent, secant, cosecant, and cotangent. These four co-fundamental functions are defined in terms of sine and cosine and their values can be quickly...

There are six basic trigonometric functions that are employed in the study of angles and angular relationships in planar and 3-dimensional figures, also known as trigonometry. They are sine (abbreviated as sin x), cosine (abbreviated as cos x), tangent...

Inverse trigonometric functions are the inverse of the different trigonometric functions sine, cosine, tangent, cotangent, secant, and cosecant. The inverse of a function is simply the reflection of that function about the line x = y and for inverse...

In mathematics, the trigonometric functions (also called circular functions) are functions of an angle. They are important in the study of triangles and modeling periodic phenomena, among many other applications. Trigonometric functions are commonly...

INTRODUCTION The typical precalculus book contains the obscure trigonometric identities known as the product-to-sum formulas [1, p. 470 ]. They usually get short treatment (or none) in a precalculus course because they are so rarely used. This is unfortunate since they have an...

The polar representation of a pair (X, Y) of spherically symmetrically distributed random variables provides an attractive route to the known fact that their ratio has a Cauchy distribution. In this note, a variety of other distributional relationships involving X and Y is...

 A lot has changed since we last published a tips article nearly two years ago. New versions of Microsoft's core software packages—Windows Vista and Office 2007—have been released, and the Internet has taken an even more central role in daily life. Our latest tips guide...