Question

If cos2A = 3/4 , then sinA is​

Answer 1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Given:-

Cos^2 A = 3/4

To find:-

Find the value of Sin A?

Solution:-

Given that Cos^2 A = 3/4

=>Cos A = √(3/4)

=>Cos A = √3/2

=>Cos A = Cos 30°

=>A = 30°

The value of A = 30°

Now the value of Sin A

=>Sin 30°

=> 1/2

Sin 30° = 1/2

Answer:-

If Cos^2 A = 3/4 then the value of Sin A = 1/2

Used formula:-

• Sin 30° = 1/2
• Cos 30° = √3/2