#### Question

The principal solution of `cos^-1(-1/2)` is :

(a) π/3

(b) π/6

(c) 2π/3

(d) 3π/2

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Solution for question: The principal solution of cos-1(-1/2) is concept: Inverse Trigonometric Functions - Inverse Trigonometric Functions - Principal Value Branch. For the courses HSC Arts, HSC Science (Computer Science), HSC Science (Electronics), HSC Science (General)