Contents radians sine, cosine & tangent cosecant, secant & cotangent Sine Rule, Cosine Rule Pythagorean Identities compound angle formulae 3 7 12 15 20 24 ©2009 A-level Maths Tutor All Rights Reserved www.a-levelmathstutor.com What is a 'radian'? 3 Radians A radian is the angle ...