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23-05-2020
Mathematics

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cos 15º cos 60° + sin 15° sin 60°
find exact value

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MathPhys MathPhys

23-05-2020

Answer:

½√2

Step-by-step explanation:

Use angle difference formula.

cos(x − y) = cos x cos y + sin x sin y

cos(60° − 15°) = cos 60° cos 15° + sin 15° sin 60°

cos(45°)

½√2

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