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# Exercise 4.2: Cosine Function and Inverse Cosine Function

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EXERCISE 4.2

1. Find all values of such that

(i) -6π ≤ x ≤ 6π and cos x = 0 (ii) -5π ≤ x ≤ 5π and cos x = 1.

2. State the reason for

3. Is cos(xcos(x) true? Justify your answer.

4. Find the principal value of cos1 (1/2)

5. Find the value of

6.Find the domain of

7. For what value of x , the inequality π/2 < cos-1 (3x -1) < π holds?

8. Find the value of

Answers:

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12th Mathematics : UNIT 4 : Inverse Trigonometric Functions : Exercise 4.2: Cosine Function and Inverse Cosine Function | Problem Questions with Answer, Solution

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