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va rog ma paote ajuta cine punctele a si b

Va Rog Ma Paote Ajuta Cine Punctele A Si B class=

Răspuns :

Bunicaluiandrei
cos6π/7 +cosπ/7 = cos(7π/7 - π/7)+cosπ/7 = cosπcosπ/7 - siπsinπ/7 +cosπ/7
= - cosπ/7 +cosπ/7 = 0
cos8π/7 + cosπ/7 = cos(7π/7 +π/7) + cosπ/7 = cosπcosπ/7 + sinπsinπ/7 + +cosπ/7 = - cosπ/7 + cosπ/7 = 0

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