Selecting the "show base function" option causes the basic function (with a = b = 1 and c = d = 0) to be graphed in red. The function with other values for the parameters appears in green. Note that ...

Trigonometry - Edexcel Trigonometric graphs - Higher. The three trigonometric ratios; sine, cosine and tangent are used to calculate angles and lengths in right-angled triangles.

National 5; Working with the graphs of trigonometric functions Phase angle. Trigonometric graphs can be sketched when you know the amplitude, period, phase and maximum and minimum turning points.

However, it's still hard to get an intuitive sense of the relationship between the circle and the trigonometric functions and the triangles. That all changes with animated GIFs. Change over time ...