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

User Mark Hannel
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1 Answer

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hello :
5cosθ = 3cosθ - 1.
5cosθ - 3cosθ = 1.
2cosθ =1
cosθ =1/2
all solutions :
cosθ =cosπ/3
all solutions :
θ =π/3 +2kπ or θ = - π/3 +2kπ ....k in Z

User PSchn
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