stodd9503
13.08.2019 •
Mathematics
Select the correct answer. which of the following is a solution to 4sin2x − 1 = 0? a. 30° b. 60° c. 90° d. 120°
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Ответ:
The correct option is A.
Step-by-step 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°
Ответ: