Mathematics, 26.02.2021 17:10, nixie167

Cos(θ - pi) = -cos θ ¿Cuál es el proceso? What´s the process? solo pude resolver esto, I could only solve this cos θ * cos pi + sen θ * sen pi cos θ * cos pi + cos (pi/2 - pi/1) * cos ( pi/2 - θ) cos θ * cos pi + cos ( -2pi/2) * cos (pi/2 - θ) cos θ * cos pi - cos pi * cos (90° - θ) cos θ * cos (90°- θ) cos θ * ( cos 90° - cos θ) cos θ * (0 - cos θ) cos θ * - cos θ -cos θ² = - cos θ no se en que me equivoque o que me falto I don´t know what I'm wrong

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Cos(θ - pi) = -cos θ ¿Cuál es el proceso? What´s the process? solo pude resolver esto, I could only...