Double Angle Formula | Ingel Soong

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Double-Angle Formula

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Double-Angle Formula are used to convert trigonometric functions with angle 2x to functions with angle x ,

Sine Formula

                   sin\,2x = 2\, sin\,x\,cos\,x 

 

Cosine Formula

                   cos\,2x = 2\, cos^2x - sin^2x

                                   = 2cos^2 x - 1

                                   = 1 - 2 sin^2 x

Tangent Formula

                  tan\,2x = \frac{2tan x}{1-tan^2x}

 

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