SOLUTION: Instructions: Solve. Give exact answers in radians, 0<_x<_2pi Problem: 2cos^2 x + sinx - 1 = 0 Thank you (:

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Question 1090342: Instructions: Solve. Give exact answers in radians, 0<_x<_2pi
Problem: 2cos^2 x + sinx - 1 = 0
Thank you (:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
2cos^2 x + sinx - 1 = 0
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Sub for cos^2
2(1-sin^2) + sin - 1 = 0
2sin^2 - sin - 1 = 0
(2sin + 1)*(sin - 1) = 0
sin(x) = 1
sin(x) = -1/2
etc