Find the exact value of expression cos40'cos10° + sin 40° sin 10°

Question

Question

Find the exact value of expression
cos40cos10° + sin 40° sin 10°

math trigonometry

Answer 1

Answer #1

Cos (A-B) = Cos A Cos B + sin A Sin B Here in question, 409 B=109 cos (40-10 Cos 40° Cos 10° + sin 40° sin 10° = cos 30° 0.86

Answer 2

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