**Trigonometric Ratios CBSE NCERT Solutions Chapter 8 Exercise 8.3 Question 6**

**6.** If A, B and C are interior angles of a triangle ABC, then show that

**Solution:**

It is given that **(1)**

We are given that A, B and C are interior angles of a triangle ABC.

Therefore,

**(2)**

**L.H.S =**

Putting **(2)** in **(1)**, we get

**L.H.S =** =**R.H.S **

** {sin(90-A) = cos A}**

**Hence Proved**