mehakbajaj34 mehakbajaj34
  • 01-04-2017
  • Mathematics
contestada

[tex]cos(3theta) =-1
[/tex]

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ghanami
ghanami ghanami
  • 01-04-2017
hello :
cos(3θ) = -1
cos(3θ) = cos(π)
general solution in : R  is 
3θ = (2k+1)π   k in  Z 
θ = (2k+1)π/3
if  θ in   [0 , 2π]   the solutions are :
k=0 :  x = π/3
k=1 :  x = π
k=2 :  x = 5π/3



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