mashupgaming19 mashupgaming19

27-10-2021
Mathematics

contestada

prove that:
cos(π/7)cos(2π/7)cos(4π/7)=-1/8

Respuesta :

wasiq4all wasiq4all

27-10-2021

Step-by-step explanation:

Multiply and divide with 2Sin(π/7)...

By The formula Sin(2A)=2Sin(A).Cos(A)...

you can simplify.....

and soon you will get -1/8

Answer Link

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