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Prove - cos(π/7)cos(4π/7)cos(5π\7) =1/8

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Prove - cos(π/7)cos(4π/7)cos(5π\7) =1/8
  • 1 answers

Gaurav Seth 5 years, 5 months ago

Answer:

Step-by-step explanation:

According to this question

Given that

Formula, sin 2x = 2 sinx cosx

cosx = 

So,

 = 

 = 

 = 

 = 

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