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professor190 [17]
3 years ago
5

Cos(x/3)cos(x/3)=1/2(1+cos(2x/3))

Mathematics
2 answers:
TEA [102]3 years ago
6 0
This follows from the half-angle identity for cosine.

\cos^2\theta=\dfrac{1+\cos2\theta}2
aleksklad [387]3 years ago
4 0

Answer:

it's true, don't have a step by step explanation just did it on my test.

Step-by-step explanation:

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