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10 August, 22:00

Use the angle difference identity to sovle 5cos2 (theta) = 1 for 0 degrees is less than or equal to theta is less than 360 degrees

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  1. 10 August, 23:12
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    Use cos (2∅) = 2cos² ∅ - 1

    5 (2cos²∅ - 1) = 1

    10cos²∅ - 5 = 1

    10cos²∅ = 6

    cos²∅ = 0.6

    cos∅ = ± √ (0.6)

    ∅ = 39.2,180 - 39.2, 180 + 39.2, 360 - 39.2

    ∅ = 39.2, 140.8, 219.2, 320.8
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