double-angle formulas for sine, cosine and tangent

In this video I show how to use the double-angle formulas for sine, cosine and tangent. I go through 2 examples, showing how to find sin2x, cos2x and tan2x. Some of the other concepts covered in this video include, trig functions in all four quadrants, reciprocal trig functions, reference angles, standard position, Pythagorean Theorem, trig ratios at a point.

Видео double-angle formulas for sine, cosine and tangent канала vinteachesmath