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Choose the CORRECT set of functions, which are linearly dependent.

  1. $\sin x , \sin^2 x$ and $\cos^2 x$
  2. $\cos x , \sin x$ and $\tan x$
  3. $\cos 2x, \sin^2 x$ and $\cos^2 x$
  4. $\cos 2x , \sin x$ and $cos x$
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