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18 July, 23:13

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

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  1. 18 July, 23:27
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    Hello:

    5cosθ = 3cosθ - 1.

    5cosθ - 3cosθ = 1.

    2cos θ = 1

    cosθ = 1/2

    all solutions:

    cosθ = cos π / 3

    all solutions:

    θ = π/3 + 2kπ or θ = - π/3 + 2kπ ... k in Z
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