Subscribe to our YouTube channel for the latest videos, updates, and tips.
Home | About Us | Contact Us | Privacy | Math Blog
The important trigonometrical ratios of submultiple angle formulae are given below:
(i) sin A = 2 sin A2 cos A2
(ii) cos A = cos2 A2 – sin2 A2
(iii) cos A = 2 cos2 A2 - 1
(iv) cos A = 1 - 2 sin2 A2
(v) 1 + cos A = 2 cos2 A2
(vi) 1 - cos A = 2 sin2 A2
(vii) tan2 A2 = 1−cosA1+cosA
(viii) sin A = 2tanA21+tan2A2
(ix) cos A = 1−tan2A21+tan2A2
(x) tan A = 2tanA21−tan2A2
(xi) sin A = 3 sin A3 - 4 sin3 A3
(xii) cos A = 4 cos3 A3 - 3 cos A3
(xiii) sin 15° = cos 75° = √3−12√2
(xiv) cos 15° = sin 75° = √3+12√2
(xv) tan 15° = 2 - √3.
(xvii) sin 22½˚ = 12√2−√2
(xvii) cos 22½˚ = 12√2−√2
(xviii) tan 22½˚= √2 - 1.
(xix) sin 18 ° = cos 72° = √5−14
(xx) cos 18° = sin 72° =
√10+2√54
(xxi) cos 36° = cos 72° = √5+14
(xxii) sin 36° = cos 54° = √10−2√54
11 and 12 Grade Math
From Submultiple Angle Formulae to HOME PAGE
Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.
Jul 11, 25 02:14 PM
Jul 09, 25 01:29 AM
Jul 08, 25 02:32 PM
Jul 08, 25 02:23 PM
Jul 08, 25 09:55 AM
New! Comments
Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.