is the value 3pi/2 is a solution for the equation 2sin^2x-sinx-1=0

Answer 1

sin 3 pi/2 = -1

2(-1)^2 -(-1) -1

2 + 1 - 1

2

Looks like a typo to me. Perhaps it should be
2 sin^2x + sinx - 1 = 0

Answer 2

False