# NCERT Class 12-Mathematics: Chapter –2 Inverse Trigonometric Function Part 9

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**Question 5:**

Find the value of

**Answer:**

We have:

[As we know that the range of the principal value branch of is ]

Hence, the value of is .

**Question 6:**

Show that

**Answer:**

LHS

**Question 7:**

Find the real solution of the equation

**Answer:**

Given that

**Question 8:**

Find the value of the expression

**Answer:**

Given that