##### 13 LECTURES

- 3(A) || Exercise 3.1
- 3(B) || Exercise 3.1
- 3(C) || Signs of Trigonometry Ratios in quadrants
- 3(D) || Exercise 3.2
- 3(E) || Exercise 3.3
- 3(F) || Identities and sin15, sin75, tan15
- 3(G) || Exercise 3.3
- 3(H) || Exercise 3.3
- 3(I) || Exercise 3.3
- 3(J) || Miscellaneous Exercise
- 3(K) || Miscellaneous Exercise
- 3(L) || Exercise 3.4, Example 22, Example 24
- 3(M) || Law of Sines & Law of Cosines Supplementary Exercise
- All YouTube Links

- This page has links to complete syllabus of NCERT Chapter 3 Trigonometric Functions based on syllabus recommended by CBSE based on class 11 maths.
- There are 13 video lectures having explanations from basic to advance concepts, each and every NCERT solutions, questions and all important examples. You can access them directly from the lecture menu or just scroll down the page.
- All lecture were uploaded on YouTube so for better learning experience here you will find link to YouTube Playlist of Chapter 3 Trigonometric Functions.
- Also, there are detailed highlights of each video lecture with exact timestamp links so that you can easily access all topics and questions directly.
**Just click on the timestamp link**and you will be redirected to video watch page at exactly that time.- You can ask doubts in Trigonometric Functions at the end of this page.

##### NCERT INDEX

- 1. Sets
- 2. Relations & Functions
- 3. Trigonometric Functions
- 4. Principle of Mathematical Induction
- 5. Complex Numbers
- 6. Linear Inequalities
- 7. Permutations & Combinations
- 8. Binomial Theorem
- 9. Sequences & Series
- 10. Straight Lines
- 11. Conic Sections
- 12. Introduction to Three Dimentional Geometry
- 13. Limits & Derivatives
- 14. Mathematical Reasoning
- 15. Statistics
- 16. Probability

## DIRECT YOUTUBE LINKS

##### 3(A) || Exercise 3.1

00:01:17 NCERT Chapter 2 Miscellaneous Exercise Question 11

00:07:37 NCERT Chapter 2 Miscellaneous Exercise Question 9

00:21:17 Meaning and origin of Word Trigonometry

00:24:47 Basics of Angles: Positive angles, negative angles, vertex with animations

00:34:57 Measuring an angle

00:36:07 Basics of Degree measure, minutes and seconds

00:40:57 Basics of Radian measure with animation

00:47:57 Relation between degree measure and radian measure

01:02:47 NCERT Exercise 3.1 Question 1 (Degree to radian conversion)

##### 3(B) || Exercise 3.1

00:05:49 NCERT Exercise 3.1 Question 2 (Radian to degree conversion)

00:21:59 NCERT Exercise 3.1 Question 3

00:25:39 Radian measure for non-unit circles

00:31:19 NCERT Exercise 3.1 Question 4

00:35:59 NCERT Exercise 3.1 Question 5

00:41:09 NCERT Exercise 3.1 Question 6

00:46:09 NCERT Exercise 3.1 Question 7

##### 3(C) || Signs of Trigonometry Ratios in quadrants

00:02:00 Basics of unit circle in trigonometry

00:10:50 Signs of trigonometry ratios in different quadrants and at different angles

00:19:11 Shortcut trick to remember signs of trigonometry ratios in different quadrant

00:22:01 NCERT Exercise 3.2 Question 1

00:26:31 NCERT Exercise 3.2 Question 2

00:29:01 NCERT Exercise 3.2 Question 3

00:31:21 NCERT Exercise 3.2 Question 4

00:33:31 NCERT Exercise 3.2 Question 5

00:36:31 Relationship between trigonometric ratios of positive and negative angles

##### 3(D) || Exercise 3.2

00:04:00 Working with unit circle in trigonometry through horizontal line, coterminal angles and allied angles

00:28:21 NCERT Exercise 3.2 Question 6

00:31:21 NCERT Exercise 3.2 Question 7

00:36:51 NCERT Exercise 3.2 Question 8

00:40:01 NCERT Exercise 3.2 Question 9

00:42:11 NCERT Exercise 3.2 Question 10

##### 3(E) || Exercise 3.3

00:02:22 Working with unit circle in trigonometry through vertical line

00:04:42 Some extra questions from NCERT Exemplar problem, CBSE Support material and other books explaining working with coterminal and allied angles

00:13:52 Working with unit circle in trigonometry (on horizontal and vertical line)

00:23:52 NCERT Chapter 3 Example 9

00:31:02 NCERT Exercise 3.3 Question 1

00:32:52 NCERT Exercise 3.3 Question 3

##### 3(F) || Identities and sin15, sin75, tan15

00:02:24 NCERT Exercise 3.3 Question 2

00:04:44 NCERT Exercise 3.3 Question 4

00:07:40 Derivation of identity for sin(A+B) using example of sin75°

00:18:44 Value of sin75° using sin(A+B) identity NCERT Exercise 3.3 Question 5 (i)

00:20:44 Derivation for sin(A-B)

00:23:54 Derivation for cos(A+B)

00:26:14 Derivation for cos(A-B)

00:29:24 Derivation for tan(A+B) and tan(A-B)

00:33:24 NCERT Exercise 3.3 Question 5 (ii) Value of tan15°

00:37:14 NCERT Chapter 3 Example 13

##### 3(G) || Exercise 3.3

00:01:52 NCERT Exercise 3.3 Question 6

00:05:22 NCERT Exercise 3.3 Question 7

00:08:02 NCERT Exercise 3.3 Question 8

00:09:52 NCERT Exercise 3.3 Question 9

00:12:32 NCERT Exercise 3.3 Question 10

00:14:52 Derivation for sin(A+B)+sin(A-B), sin(A+B)-sin(A-B), cos(A+B)+cos(A-B), cos(A+B)-cos(A-B)

00:18:12 NCERT Exercise 3.3 Question 11

00:21:32 Derivation for twice angles sin2x, cos2x and tan2x

00:32:42 NCERT Exercise 3.3 Question 24

00:36:32 NCERT Exercise 3.3 Question 23

##### 3(H) || Exercise 3.3

##### 3(I) || Exercise 3.3

00:01:04 NCERT Exercise 3.3 Question 16

00:04:04 NCERT Exercise 3.3 Question 17

00:06:14 NCERT Exercise 3.3 Question 18

00:07:24 NCERT Exercise 3.3 Question 19

00:09:44 NCERT Exercise 3.3 Question 20

00:12:24 NCERT Exercise 3.3 Question 21

00:19:04 NCERT Exercise 3.3 Question 25

00:25:04 Derivation for cot(A+B) and cot(A-B)

00:32:24 NCERT Exercise 3.3 Question 22

00:37:44 NCERT Chapter 3 Example 14

##### 3(J) || Miscellaneous Exercise

00:00:14 Chapter 3 Miscellaneous Exercise Question 1

00:05:14 Chapter 3 Miscellaneous Exercise Question 2

00:07:14 Chapter 3 Miscellaneous Exercise Question 3

00:09:34 Chapter 3 Miscellaneous Exercise Question 4

00:11:34 Chapter 3 Miscellaneous Exercise Question 5

00:15:14 Chapter 3 Miscellaneous Exercise Question 6

00:18:24 Chapter 3 Miscellaneous Exercise Question 7

00:23:24 Chapter 3 Example 25

00:28:34 Chapter 3 Example 26

##### 3(K) || Miscellaneous Exercise

00:00:43 Derivation for half angles, sin(x/2), cos(x/2) and tan(x/2)

00:12:03 Chapter 3 Example 27

00:18:03 Chapter 3 Example 28

00:36:43 Chapter 3 Miscellaneous Exercise Question 8

00:43:23 Chapter 3 Miscellaneous Exercise Question 9

00:47:43 Chapter 3 Miscellaneous Exercise Question 10

00:57:13 Chapter 3 Example 29

##### 3(L) || Exercise 3.4, Example 22, Example 24

00:00:00 Introduction to Trigonometry Equations

00:04:29 Derivation of general solutions for zeroes trigonometry equations

00:19:29 Derivation of general solutions for non zeroes trigonometry equations General Solutions and Principal Solutions

00:39:49 NCERT Exercise 3.4 Question 1

00:44:39 NCERT Exercise 3.4 Question 2

00:47:49 NCERT Exercise 3.4 Question 3

00:52:19 NCERT Exercise 3.4 Question 4

00:56:19 NCERT Chapter 3 Example 22

01:00:29 NCERT Exercise 3.4 Question 5

01:05:29 NCERT Exercise 3.4 Question 6

01:08:09 NCERT Exercise 3.4 Question 7

01:10:43 NCERT Exercise 3.4 Question 8

01:13:33 NCERT Exercise 3.4 Question 9

01:17:13 NCERT Chapter 3 Example 24

##### 3(M) || Law of Sines & Law of Cosines Supplementary Exercise

00:00:00 Purpose for Law of Sines and Law of cosines

00:06:57 Derivation of Law of sines for Acute angles

00:15:47 Derivation of Law of sines for Obtuse angles

00:24:47 Derivation of Law of cosines for Acute angles

00:38:57 Derivation of Law of cosines for Obtuse angles

00:44:42 Derivation of Law of sines and Law of cosines for right angle

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