Evaluate \(\cos B - \cos 13B\)
University of Ilorin MTH101 ester past question
- \(2\sin 7B \sin 6B\)
- \(-2\sin 7B \sin 6B\)
- \(2\sin 7B \cos 6B\)
- \(-2\sin 7B \cos 6B\)
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