manishpkhrl88 manishpkhrl88

14-10-2019
Mathematics

contestada

Prove that: Cos2pi/7+cos4pi/7+cos8pi/7=-1/2

Respuesta :

Аноним Аноним

14-10-2019

Answer:

1. use a calculator to help

2. that's wrong because it equals 1.333...

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