√3(sin^4 15- cos^4 15)...

matullin @matullin

October 2021 1 11 Report

√3(sin^4 15- cos^4 15)

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ARHO

$\sqrt{3}(sin^4 15- cos^4 15)=\sqrt{3}(sin^2 15- cos^2 15)(sin^2 15+ cos^2 15)=$

$=\sqrt{3}(sin^2 15- cos^2 15)=-\sqrt{3}cos30=-\frac{3}{2}$

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