mehakbajaj34 mehakbajaj34

01-04-2017
Mathematics

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

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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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