There are three main trigonometric functions - Sine θ (sin θ), Cosine θ (cos θ) and Tangent θ (tan θ). ... 45°, 60°, and 90°. But it is difficult to memorise the values.

Sine, cosine and tangent are the principle trigonometric functions. (Image credit: ... For our demo, the equation is: tan(71°) = 2.90. (We'll explain how we got that answer later.) ...

Revise trigonometric ratios of sine, cosine and tangent and calculate angles in right-angled triangles with this Bitesize GCSE Maths Edexcel guide.

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