Question

if sin A=0.4 then find sin 3A​

Answer 1

Answer:

Step-by-step explanation:

∴ Sin 3A = 3 sin A - 4 sin³ A

Use Formula and Solve

Sin 3A = 3 (0.4) - 4 (0.4)³

           = 0.944

∴ Sin3A = 0.944

This is the required answer

Answer 2

If sin A = 0.4 then sin 3A = 0.944

Given :

sin A = 0.4

To find :

The value of sin 3A

Formula :

sin 3A = 3 sin A - 4 sin³ A

Solution :

Step 1 of 2 :

Write down the given value

Here it is given that sin A = 0.4

Step 2 of 2 :

Find the required value

sin 3A = 3 sin A - 4 sin³ A

⇒ sin 3A = 3 × 0.4 - 4 × 0.4³

⇒ sin 3A = 1.2 - 4 × 0.064

⇒ sin 3A = 1.2 - 0.256

⇒ sin 3A = 0.944

━━━━━━━━━━━━━━━━

Learn more from Brainly :-

$1.$ If cosθ+secθ=√2,find the value of cos²θ+sec²θ

https://brainly.in/question/25478419

2. Value of 3 + cot 80 cot 20/cot80+cot20 is equal to

https://brainly.in/question/17024513

3. In a triangle, prove that (b+c-a)(cotB/2+cotC/2)=2a×cotA/2

https://brainly.in/question/19793971