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[tex] \sqrt{200}*cos ^{2} (15P/8)- \sqrt{50}
[/tex]
Где P-это Пи
[tex] \sqrt{200}*cos ^{2} (15P/8)- \sqrt{50}
[/tex]
Где P-это Пи
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10√2cos²(2π-π/8)-5√2=10√2cos²π/8-5√2=5√2*(2cos²π/8-1)==5√2*cosπ/4=5√2*√2/2=5
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2cos²x-1=cos2x