compound angle formulae

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(in trigonometry)

The trigonometric functions of the sum or difference of two angles can be expressed in terms of the functions of the individual angles.

sin (A ± B)=sinA cosB ± cosA sinB,

cos (A ± B)=cosA cosB ∓ sinA sinB,

These can be manipulated to express sums and differences of sine or cosines in alternative forms:

Subjects: Mathematics.

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