Which expression is equivalent to cos(1.4x) – cos(0.6x)?

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Which expression is equivalent to cos(1.4x) – cos(0.6x)?

Mathematics
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\[-2\sin (x) \sin (0.8x)\]
Use the (Simpson) formula for the difference of two cosines: \(\cos a-\cos b=-2\sin\frac{a+b}{2}\sin\frac{a-b}{2}\) Just put in a=1.4x and b=0.6x!
BTW it is a good idea to learn all the trig identities by heart. Then, when confronted with a problem, you will get ideas to solve them. If you have to look up these formulas every time, you will always have trouble solving trig problems.

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