awillis2k awillis2k
  • 19-06-2017
  • Mathematics
contestada

Find all solutions to 5cosθ = 3cosθ - 1.

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ghanami
ghanami ghanami
  • 20-06-2017
hello : 
5cosθ = 3cosθ - 1.   
5cosθ - 3cosθ = 1.
2cos
θ =1
cosθ =1/2
all solutions : 
 cosθ =cosπ/3
all solutions :
θ =π/3 +2kπ     or θ = - π/3 +2kπ ....k in Z

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