3 years ago

The value

Mathematics

1 answer:

ehidna [41]3 years ago

7 0

Answer:

Step-by-step explanation:

Check the solution by substituting x = $\frac{\pi }{2}$ into the left side of the equation

2sin²x - sinx - 1

= 2sin²( $\frac{\pi }{2}$ ) - sin ( $\frac{\pi }{2}$ ) - 1

= 2(1)² - 1 - 1

= 2 - 1 - 1

= 0

= right side

$\frac{\pi }{2}$ is therefore a solution to the equation

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