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Addition Formula for Sine


	The addition formula for sine states that . All triangle hypotenuses in the above figures are of unit length, so that the sines and cosines are simply the adjacent or opposite sides of their triangles relative to the angles , , or . The gray areas on the left and right equal the left and right sides of the formula. When , the formula reduces to the double-angle formula .


	Contributed by: Chris Boucher

Double-Angle Formulas (Wolfram MathWorld)

Sine (Wolfram MathWorld)

Trigonometric Addition Formulas (Wolfram MathWorld)

"Addition Formula for Sine" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/AdditionFormulaForSine/

Contributed by: Chris Boucher

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