[tex]\sqrt{2} *cos (4*\ \frac{\pi}{4}) +\sqrt{2}= \sqrt{2} *cos(\pi) +\sqrt{2} = \sqrt{2} *(-1) +\sqrt{2}= - \sqrt{2}+ \sqrt{2}= 0
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[tex]\sqrt{2} *cos (4*\ \frac{\pi}{4}) +\sqrt{2}= \sqrt{2} *cos(\pi) +\sqrt{2} = \sqrt{2} *(-1) +\sqrt{2}= - \sqrt{2}+ \sqrt{2}= 0