# Category Archives: Trigonometry

## Slopes of tangent lines

One of the most difficult items for the Philippine sample in the Trends and Issues in Science and Mathematics Education Study (TIMSS) for Advanced Mathematics and Science students conducted in 2008, is about comparing the slopes of the tangent at a point on a curve. The question is constructed so that it assesses not only… Read More »

## Teaching trigonometry via problem solving

I believe that the best way to learn mathematics is through solving problems. However, most problems are found at the end of unit or chapters. Because we are in a hurry to cover the textbooks or the curriculum, we skip the problem solving part and then we complain that our students are very poor in… Read More »

## Algebra test items: Trigonometric Functions

This is my third post on constructing test items based on TIMSS Assessment Framework. My first set of examples is about assessing understanding of zeros of polynomial function and the second post is about graphs of rational functions. Of course there are other frameworks that may be used for constructing test item like the Bloom’s… Read More »

## Trigonometry – why study triangles

We study Trigonometry because it is useful. Its earliest and simplest use is to find the missing part of a triangle. But mathematicians do not just study something because it is useful. More often, they study something because it is fascinating. What is so special about triangles? Why did mathematicians created a branch of mathematics… Read More »