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