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Cos 130 cos 40 + sin 130 sin 40
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Cos 130 cos 40 + sin 130 sin 40

User ShapCyber
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1 Answer

1 vote
cos(a)cos(b) + sin(a)sin(b) = cos(a-b)

cos(130-40) = cos(90) = 0
User Andy Lobel
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