Home >> PURE MATHS, Trigonometry, compound angles

The Six Compound Angle Identities

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Double Angle Formulae

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Factor Formulae

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'rcos()' Form

Adding a sine and a cosine will generate a cosine curve. This will have a larger amplitude than the original and is out of phase with it.

Writing the expression as rcos(θ - α),

where,

'r' amplitude
'α' no. degrees phase difference(to the right)

Thus expressions of the form:

can be rewritten as:

Finding 'r' and the Phase Angle 'α' (alpha)

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