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Annuffka
@Annuffka
August 2022
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sinx^4-cosx^4+2cosx^2=1 Докажите тождество.
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mmb1
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Sin^4-cos^4=(sin^2+cos^2)(sin^2-cos^2)=-(cos^2-sin^2)=1-2cos^2 x
1-2cos^2(x)+2cos^2(x)=1
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Sin^4-cos^4=(sin^2+cos^2)(sin^2-cos^2)=-(cos^2-sin^2)=1-2cos^2 x1-2cos^2(x)+2cos^2(x)=1