Mathematics, 04.02.2021 04:20 HalpMehPlz

Explain how the sum and difference formula cos(A+/- B) = cosA cosB -/+ sinA sinB be useful? I've just got no idea for this one. Any help is appreciated.

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Explain how the sum and difference formula cos(A+/- B) = cosA cosB -/+ sinA sinB be useful? I've ju...

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