Look up the sum formulae for trig functions.
The one you need is cos - cos.
Paul M.
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Yup!
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03/18/20
Palera V.
asked • 03/18/20Calculus Question
Express this product as an algebraic sum: 2 sin 3θsin 5θ.
a. – cos 8θ + cos 2θ
b. – cos 8θ- cos 2θ
c. cos 8θ - cos 2θ
d. cos 8θ + cos 2θ
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Palera V.
Applying the sum formula, I got answer b. Is it correct?03/18/20