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Povilaitis
@Povilaitis
July 2022
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Докажите тождество а) (sin a/2 -cos a/2)
²
= 1 - sin a
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lidusya13
Sin^a/2-2sin a/2•cos a/2+cos^a/2=1-sin a
1-sin a=1-sin a
(sin^ a/2+cos^a/2=1; и -2sin a/2cos a/2=-sin 2•a/2=-sin a)
3 votes
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Answers & Comments
1-sin a=1-sin a
(sin^ a/2+cos^a/2=1; и -2sin a/2cos a/2=-sin 2•a/2=-sin a)