HSC Arts 12th Board ExamMaharashtra State Board
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The principal solution of cos-1(-1/2) is - HSC Arts 12th Board Exam - Mathematics and Statistics

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Question

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

(a) π/3

(b) π/6

(c) 2π/3

(d) 3π/2

Solution

The principal solution of `cos^-1(-1/2)= ` An angle in [0,π], whose cosine is -1/2

⇒ `cos^-1(-1/2)=(2pi)/3`

  Is there an error in this question or solution?

APPEARS IN

 2014-2015 (March) (with solutions)
Question 1.1.2 | 2.00 marks
Solution The principal solution of cos-1(-1/2) is Concept: Inverse Trigonometric Functions - Inverse Trigonometric Functions - Principal Value Branch.
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