Solve on the interval 0 ≤ θ < 2π Cos(2θ-π/2)=-1

asked Jun 23, 2017 698 views

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Solve on the interval 0 ≤ θ < 2π
Cos(2θ-π/2)=-1

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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°

Jose Alban answered Jun 28, 2017

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