# CBSE Class 10-Mathematics: Chapter –8 Introduction to Trigonometry Part 2

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**Question 7:**

If prove that .

**Answer:**

**Question 8:**

If A, B are acute angles and , then find the value of .

**Answer:**

**Question 9:**

(a) Solve for , if

**Answer:**

(b) Solve for if .

**Answer:**

**Question 10:**

If show that

**Answer:**

LHS

**Question 11:**

If prove that

**Answer:**

P.T