# CBSE Class 10-Mathematics: Chapter – 8 Introduction to Trigonometry Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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## Introduction to Trigonometry

“The mathematician is fascinated with the marvelous beauty of the forms he constructs, and in their beauty he everlasting truth.”

**Question 1**:

If prove that .

**Answer**:

Squaring and adding

.

**Question 2**:

Prove that can never be less than 2.

**Answer**:

can never be less than 2.

If possible, let it be less than 2.

.

Which is not possible.

**Question 3**:

If show that

**Answer**:

Substituting in place of We get .

**Question 4**:

If , show that

**Answer**:

If

**Question 5**:

If , prove that

**Answer**:

**Question 6**:

If

**Answer**:

RHS