Question

Which of the following is a solution to 4sin2x − 1 = 0?

Answer 1

x=0.12634012+

`\\\pi144445618`

Answer 2

A. 30

Explanation:

The correct form is:

4sin^2 x − 1 = 0

First step is add 1 to both sides:

4sin^2 x-1+1=0+1

4sin^2 x=1

Now to eliminate 4 divide both sides by 4

4sin^2 x/4=1/4

sin^2 x=1/4

Take square root at both sides

√sin^2 x = √1/4

sinx = 1/2

Thus the correct option is 30° ....