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The value

Pi /2
is a solution for the equation 2 sin^2 x- sin x-1=0.
O A. True
B. False

1 Answer

3 votes

Answer:

A

Explanation:

Check the solution by substituting x =
(\pi )/(2) into the left side of the equation

2sin²x - sinx - 1

= 2sin²(
(\pi )/(2) ) - sin (
(\pi )/(2) ) - 1

= 2(1)² - 1 - 1

= 2 - 1 - 1

= 0

= right side


(\pi )/(2) is therefore a solution to the equation

User Yongji
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