WebSolution Given A = 30° sin 3A = sin 3 (30°) = sin 90° =1 3 sin A – 4 sin 3 A = 3 sin 30° – 4 sin 3 30° = 3 ( 1 2) – 4 ( 1 2) 3 = 3 2 – 1 2 = 1 ∴ sin 3A = 3 sin A – 4 sin 3 A Concept: … WebFirst write sin 3 θ as sin ( θ + 2 θ), and use the sine of sum formula. Then write cos 2 θ as 1 − 2 sin 2 θ and sin 2 θ as 2 sin θ cos θ. From there, use cos 2 θ = 1 − sin 2 θ, and simple algebra gets you the rest of the way. Share Cite Follow answered Jan 25, 2016 at 17:40 Brian Tung 32.8k 3 39 72

ia802500.us.archive.org

Web22 jul. 2024 · Best Answer. #1. +506. +2. Note: make sure to know sin/cos angle addition/subtraction identities, sin/cos double angle identities, the Pythagorean identity, … WebAnswer (1 of 8): Okay, well, who am I to joke with, this is simply a question from the beginning of 2024 and now I’m answering it in 2024. Well, this equation has some use in … muckraker that exposed meat industry

Prove the following identity. sin 3θ = 3 sin θ − 4 sin3 θ - Brainly.com

Web9 nov. 2015 · I tackle questions like this in 3 steps: 1) Apply De Moivre's Theorem 2) Use Pascals Triangle (Proves quicker for me than the method of Binomial Expansion) 3) Know your Trig Identities because this is where you're headed My working so far: ( cos θ + i sin θ) 3 = ( cos 3 θ + i sin 3 θ) By De Moivre's Theorem Web4 apr. 2024 · put the value of sin30 as 0.5 in (1) we get, on solving we get, sin3Ф-4sin^3Ф=1. Now taking LHS which is sin3Ф. put the value of Ф as 30° in sin3Ф. we get, =sin3 (30) =sin90°. Web11 okt. 2024 · If = 300 , then 3sin - 4 sin3 = See answer Advertisement sonaligusain35 Answer: if 300 what? Step-by-step explanation: please write question properly … how to make things walls in rpg maker mv