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michegraf
@michegraf
August 2022
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Корень из 3(сos^4 15-sin^4 15) решите!
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kattyski
Корень из трех буду обозначать как sqrt(3)
sqrt(3)(cos^2 15- sin^2 15)(cos^2 15+sin^2 15)=sqrt(3)(cos^2 15- sin^2 15)*1=sqrt(3)cos 30= sqrt(3)*sqrt(3)/2=3/2=1,5
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Answers & Comments
sqrt(3)(cos^2 15- sin^2 15)(cos^2 15+sin^2 15)=sqrt(3)(cos^2 15- sin^2 15)*1=sqrt(3)cos 30= sqrt(3)*sqrt(3)/2=3/2=1,5