A model of the famous toy known as a spirograph. A circle of radius r (see blue circle below) is allowed to roll around the inside of a circle of radius R (see black circle below). We assume that the ...

Abigail B. Gonzales assists the participants in graphing various functions. PANGLAO, Bohol—Teachers need to level up their teaching techniques, especially in mathematics. To train the teachers, the ...

Cosine and sine of an angle θ are defined to be the x and y-coordinates of the point P on the unit circle with the property that the line from O to P makes and angle θ with the positve x-axis. cos(θ) ...