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Asie16
@Asie16
July 2022
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Упростите выражение :cos (α +β)+cos(α-β)
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sova761
:cos (α +β)+cos(α-β)=
cosαcosβ - sin αsin β + cosαcosβ + sin αsin β= 2cosαcosβ.
2 votes
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Asie16
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Answers & Comments
cosαcosβ - sin αsin β + cosαcosβ + sin αsin β= 2cosαcosβ.