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Яноса
@Яноса
November 2021
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cos^2 x-sin^2 x<2 nf sin x/2>1/2
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shakera2004
По формуле разности кватратов имеем
(sin^2x+cos^2x)(sin^2x-cos^2x)=sin2x.
-cos2x=sin2x (:cos2x)
tg2x=-1
2x=arctg(-1)+Пn
2х=-П/4+Пn
x=-П/8+Пn/2, n прин Z.
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Answers & Comments
(sin^2x+cos^2x)(sin^2x-cos^2x)=sin2x.
-cos2x=sin2x (:cos2x)
tg2x=-1
2x=arctg(-1)+Пn
2х=-П/4+Пn
x=-П/8+Пn/2, n прин Z.