# NCERT Solutions for Class 10 Maths Chapter 8 Exercise 8.3

NCERT Solutions for class 10 Maths Chapter 8 Exercise 8.3 Introduction to Trigonometry PDF file format to free download or view online without downloading for current academic session 2020-21 based on NCERT Books 2020-21.

Use Offline Apps 2020-2021 in Hindi Medium and English Medium free for CBSE as well as UP Board students who are following CBSE guidelines and following CBSE Syllabus from 2020-21 for their upcoming exams in March 2021. Download (Exercise 8.3) in PDF format this page.

## NCERT Solutions for class 10 Maths Chapter 8 Exercise 8.3

 Class: 10 Maths (English and Hindi Medium) Chapter 8: Exercise 8.3

• ### Class 10 Maths Exercise 8.3 Solutions

#### Class 10 Maths Chapter 8 Exercise 8.3 Solution in Videos

Class 10 Maths Exercise 8.3 Explanation
Class 10 Maths Chapter 8 Exercise 8.3 Solution

#### Questions on Trigonometry for Practice

1. If tan (3x – 15) = 1 then find the value of x. [Answer: 20]
2. Prove that: tan cot A/(1 – cot A) + cot A/(1 – tan A) = 1 + tan A + cot A.
3. Prove that: (sin θ + cosec θ)² + (cos θ + sec θ)² = 7 + tan² θ + cot² θ
4. Prove that: sec A (1 – sin A) (sec A + tan A) = 1.

##### Questions from Board Papers
• 1. If cos B + sin B = √2 cos B, then show that cos B – sin B = √2 sin B.
• 2. If tan A + sin A = m, tan A – sin A = n, then show that m² – n² = 4√(mn).
• 3. If sec A = x = 1/4x, prove that sec A + tan A = 2x or 1/2x.
• 4. If sin α + sin² α = 1, prove that cos² α + (cos² α)² = 1.     