Double Angle Formulas: 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 ...

The first includes definitions, trigonometrical ratios, and multiple and sub-multiple angles, ... A Short Course of Elementary Plane Trigonometry. By Charles Pendlebury. Pp. xi + 160.

Trigonometry - Eduqas Calculating an angle. The three trigonometric ratios; sine, cosine and tangent are used to calculate angles and lengths in right-angled triangles.

Revise trigonometric ratios of sine, cosine and tangent and calculate angles in right-angled triangles with this BBC Bitesize GCSE Maths OCR study guide. ... Trigonometry - OCR Calculating an angle.