Trigonometric Identities Formulas that may involve trigonometric functions, trigonometric identities accurately represent all variables’ values. Trigonometric Ratio Not used as often as the trigonometric identities, trigonometric ratio are formulas that define the relationship between the angles’ measurement and...
Next, you can use parity to reduce the range further. That is, since sin(−x) = −sin(x) and cos(−x) = cos(x) you can reduce the problem to computing the sine or cosine of an angle between 0 and 180°. The identities sin(180° −x) = sin(x) and cos(180° −x)...
Double-angle identities are derived from the sum formulas of the fundamental trigonometric functions: sine, cosine, and tangent. See (Figure), (Figure), (Figure), and (Figure). Reduction formulas are especially useful in calculus, as they allow us to reduce the power of the trigonometric...
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 ...