# NCERT Class 11-Math's: Exemplar Chapter 3 Trigonometric Functions Part 12

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**Question 14:**

If then show

**Answer:**

Given,

To prove:

We know that:

As we have to prove

d,

Hence,

**Question 15:**

If , then find the general value of .

**Answer:**

**Question 16:**

Find the most general value of satisfying the equation and

**Answer:**

**Question 17:**

If hen find the general value of .

**Answer:**

**Question 18:**

If then find the value of .

**Answer:**

**Question 19:**

If then find the value of

**Answer:**