# NCERT Class 12-Mathematics: Chapter –2 Inverse Trigonometric Function Part 5

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**Question 24:**

The value of is

(A)

(B)

(C)

(D)

**Answer:**

(D) Is the correct answer.

**Question 25:**

The principal value of the expression is

(A)

(B)

(C)

(D)

**Answer:**

(A) Is the correct answer.

**Question 26:**

The value of is

(A)

(B)

(C)

(D)

**Answer**

(D) Is the correct answer.

Let , then

**Question 27:**

If for some , then the value of is

(A)

(B)

(C)

(D)

**Answer:**

(B) Is the correct answer.

We know . Therefore

**Question 28:**

The domain of is

(A)

(B)

(C)

(D)

**Answer:**

(C) Is the correct answer.

Let .

Now which gives

**Question 29:**

The principal value of is

(A)

(B)

(C)

(D)

**Answer:**

(B) Is the correct answer.