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$ x(t)=4\cos(t)+4\jmath\sin(t) $


Compute $ E\infty $ $ |x(t)|=|4\cos(t)+4\jmath\sin(t)|=\sqrt{16\cos^2(t)+16\sin^2(t)}=4 $

   $ E\infty=\int_{-\infty}^\infty |4|^2\,dt=16t|_{-\infty}^\infty $
   $ E\infty=\infty $

Compute $ P\infty $

   $ P\infty=lim_{T \to \infty} \ \frac{1}{(2T)}\int|4|^2dt $
   $ P\infty=lim_{T \to \infty} \ \frac{1}{(2T)}*16|_{-T}^T $
   $ P\infty=lim_{T \to \infty} \ \frac{1}{(2T)}*16(T-(-T)) $
   $ P\infty=lim_{T \to \infty} \ 16 $
   $ P\infty=16 $

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