# CBSE Class 10-Mathematics: Chapter –8 Introduction to Trigonometry Part 1

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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