Asked by terry
Write the given expression as the cosine of an angle. cos 60° cos 65° − sin 60° sin 65°
Answers
Answered by
Reiny
you should recognize this as the use of
cos(A+B)
cos 60° cos 65° − sin 60° sin 65°
= cos(60°+65°)
= cos 125°
cos(A+B)
cos 60° cos 65° − sin 60° sin 65°
= cos(60°+65°)
= cos 125°
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