3 years ago

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

2 answers:

TEA [102]3 years ago

6 0

This follows from the half-angle identity for cosine.

$\cos^2\theta=\dfrac{1+\cos2\theta}2$

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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