# CBSE Class 10-Mathematics: Chapter – 8 Introduction to Trigonometry Part 6 (For CBSE, ICSE, IAS, NET, NRA 2022)

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**Question 10**:

If , prove that .

**Answer**:

Given:

**Question11**:

If , where is an acute angle, find the value of A.

**Answer**:

Given:

**Question12**:

If A, B and C are interior angles of a , then show that

**Answer**:

Given: A, B and C are interior angles of a .

**Question13**:

Express in terms of trigonometric ratios of angles between and

**Answer**:

**Question14**:

Express the trigonometric ratios and in terms of .

**Answer**:

For ,

By using identity

For

By using identity

For