найдите значение выражения 5 корень из 2 cos (-11 п/4 ). Created by minnnimaus. algebra-ru

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August 2022 1 10 Report

найдите значение выражения 5 корень из 2 cos (-11 п/4 )

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$5 \sqrt{2}cos(-11\pi/4)= 5 \sqrt{2}cos(11\pi/4)=5 \sqrt{2}cos(12\pi/4-\pi/4)=\\\\=5 \sqrt{2}cos(3\pi-\pi/4)=5 \sqrt{2}cos(\pi-\pi/4)=5 \sqrt{2}(-cos\pi/4)=\\\\=5 \sqrt{2}(- \frac{ \sqrt{2} }{2})=-5$

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Verified answer

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v treugolnike abc ugolc raven 90 gradusovbc5 kornej iz 21ab25najdite cosa

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