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24 November, 17:12

Solve on the interval 0 ≤ θ < 2π

Cos (2θ-π/2) = - 1

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  1. 24 November, 20:30
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    Cos (2 t - π/2) = - 1

    2 t - π/2 = π

    2 t = π + π/2

    2 t = 3π/2

    t = 3π/2 : 2

    t = 3π/4 = 135°
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