Test Academy | What is the value of cos-1(-x) for all x belongs to [-1, 1]? cos⁻¹(-x), π – cos⁻¹(x), π

Question

What is the value of cos-1(-x) for all x belongs to [-1, 1]?

Options :

cos⁻¹(-x)
π – cos⁻¹(x)
π – cos⁻¹(-x)
π + cos⁻¹(x)

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