Question

If SinA = 0.4 then value of Sin 3A​

Answer 1

Step-by-step explanation:

we have trignometry formula for sin3a

sin 3a= 3 sina - 4 sin^3a

given sina=3/4

sin 3a=3(3/4)-4(3/4)^3

9/4–27/16

=36–27/16

sin 3a=9/16

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

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