if cos x = 4/11 find cos 2A (HELP PLEASE)

if cos x = 4/11 find cos 2A (HELP PLEASE)

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by 2A do you mean 2x?

If that's the case, then your'e going to do arc cos of 4/11, which yields x, then plug that value of x into cos2x

i dnt get ti can you walk me through it

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