Double angle formulas are named so because they involve trigonometric functions of double angles, i.e., sin2θ, cos2θ and tan2θ. There are three main double angle formulas as below: where θ is ...

Good ol' trig: that bastion of angles and triangles is essential to calculating velocity, ... Maybe you can use the double angle formula and you don't have a problem with trig identities.

Learn and revise trigonometric ratios of sine, cosine and tangent and calculate angles and lengths in right-angled triangles with GCSE Bitesize AQA Maths.

Bearings are angles used in navigation. They are based on moving clockwise from due north. Missing information about bearings can be worked out using the sine and cosine rules.