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10 cards from this deck
Converts the sum of trigonometric functions into a product.
Turns the product of trigonometric functions into a sum.
2 sin((A±B)/2) cos((A∓B)/2)
2 cos((A+B)/2) cos((A-B)/2)
-2 sin((A+B)/2) sin((A-B)/2)
Use sin A - sin B = 2 cos((A+B)/2) sin((A-B)/2).
Simplifying trigonometric equations and integrals.
They simplify complex expressions in various math fields.
Rearranging into a product form using cosine identities.
Studying wave functions and frequencies.
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