Math, asked by SHABEEBSADIQ89, 1 month ago

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 CopyThat
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 Anonymous
70

Answer:

= Sin3(30°)  (∵Sin3θ = 3Sinθ - 4Sin³θ)

= Sin90°

= 1

Step-by-step explanation:

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