if 2cosA = √3 prove that 3sinA - 4sin³A = 1. it's important. don't spam spammers will be Reported. I'll mark Brainliest.
Answers
Answered by
6
Answer:
Step-by-step explanation:
We have,
- 2 cos A = √3
So,
- cos A = √3/2
We know,
⇒ cos 30° = √3/2
∴ A = 30°
So,
- 3 sin A - 4 sin³ A = 1
We know,
- sin 3 A = 3 Sin A - 4 Sin³ A
Hence,
⇒ sin (3 × 30)°
⇒ sin 90°
- 1
∴ L.H.S = R.H.S
Answered by
70
Answer:
= Sin3(30°) (∵Sin3θ = 3Sinθ - 4Sin³θ)
= Sin90°
= 1
Step-by-step explanation:
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