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Tamilnadu Samacheer Kalvi 9th Maths Solutions Chapter 6 Trigonometry Ex 6.2

9th Maths Exercise 6.2 Samacheer Kalvi Question 1.
Verify the following equalities:
(i) sin2 60° + cos2 60° = 1
(ii) 1 + tan2 30° = sec2 30°
(iii) cos 90° = 1 – 2 sin2 45° = 2 cos2 45° – 1
(iv) sin 30° cos 60° + cos 30° sin 60° = sin 90
9th Maths Exercise 6.2 Samacheer Kalvi Solutions Chapter 6 Trigonometry
Solution:
9th Maths Exercise 6.2 Solutions Chapter 6 Trigonometry Samacheer Kalvi
9th Maths Trigonometry Exercise 6.2 Solutions Chapter 6 Samacheer Kalvi
9th Maths 6.2 Solutions Chapter 6 Trigonometry Samacheer Kalvi
9th Class Maths Exercise 6.2 Solutions Chapter 6 Trigonometry Samacheer Kalvi

9th Maths Exercise 6.2 Question 2.
Find the value of the following:
9th Class Maths 6.2 Solutions Chapter 6 Trigonometry Samacheer Kalvi
Solution:
9th Maths Solutions Samacheer Kalvi Chapter 6 Trigonometry Ex 6.2

9th Maths Trigonometry Exercise 6.2 Question 3.
Verify cos 3A = 4 cos3A – 3 cos A, when A = 30°
Solution:
L.H.S = cos 3A = cos 3(30°) = cos 90° = 0
R.H.S = 4 cos3A – 3 cos A = 4 cos330° – cos 30°
Trigonometry Class 9 Samacheer Kalvi Solutions Chapter 6 Ex 6.2
(1) = (2). Hence it is verified.

9th Maths 6.2 Question 4.
Find the value of 8 sin 2x cos 4x sin 6x, when x = 15°
Solution:
8 sin 2(15°).cos 4(15°).sin 6(15°)
Samacheer Kalvi 9th Maths Book Solutions Chapter 6 Trigonometry Ex 6.2

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