The triangular array formed from the coefficients of sin + cos is discussed in relation to Pascal's triangle. (JG)

Using the secant ratio rather than the cosine in trigonometric calculations is discussed. (DT)

The author responds to a lecture given by Dieudonne, reported in the September 1973 issue of this journal, by considering the goals for mathematics instruction and by defending the selection of content and approaches for geometry, algebra, and trigonometry. (DT)

The method involving properties of complex numbers and polar coordinates is used in deriving the formulas for the sine of the sum of two angles, the tangent of the difference of two angles, and the sine of the double angle. (DT)

A mathematical misteak" is an incorrect operation that leads to a correct result. An introduction to the use of the misteak" to emphasize the mathematical operations being taught. Examples and brief explanations of several types of misteaks" are given. (FL)

An identity for sin x/x is proved. Rate of convergence, a geometric interpretation, and an application from physics are discussed. (DT)

By introducing elementary trigonometry earlier in a geometry course, a teacher can demonstrate how a variety of techniques can be brought to bear on the same problem. Eight theorems illustrate this. (Author/KM)

An examination problem and solution gives rise to the question of whether there actually exists a theorem concerning the minimal period of the sum of certain periodic functions. The author discusses such a theorem and uses the situation to support mathematical education as opposed to the teaching of mathematics. (MN)

Functions defined on a unit square are considered, so that a basis may be established to carry over important features to the circular functions. (DT)