# CBSE Class 10-Mathematics: Chapter – 8 Introduction to Trigonometry Part 9 (For CBSE, ICSE, IAS, NET, NRA 2022)

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**Question 2**:

If , evaluate:

(i)

(ii)

**Answer**:

Consider a triangle ABC in which

Let

Then, using Pythagoras theorem,

(i)

(ii)

**Question 3**:

If , check whether

or not.

**Answer**:

Consider a triangle ABC in which .

And

Let .

Then, using Pythagoras theorem,

And

Now, L. H. S.