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What is cos 10° cos 8° − sin 10° sin 8° equal to?
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What is cos 10° cos 8° − sin 10° sin 8° equal to?

User Kresimir
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Answer:

Explanation:

cos 10° cos 8° − sin 10° sin 8° = cos(10° + 8°) = cos(18°)

User Carlos Fonseca
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