SOLUTION: can you please help me solve this trigonometric equation: 2sin^2x-cosx-1=0

Question 448352: can you please help me solve this trigonometric equation:
2sin^2x-cosx-1=0
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
can you please help me solve this trigonometric equation:
2sin^2x-cosx-1=0
..
for 0 2sin^2x-cosx-1=0
2(1-cos^2x)-cosx-1=0
2-2cos^2x-cosx-1=0
-2cos^2x-cosx+1=0
2cos^2x+cosx-1=0
(2cosx-1)(cosx+1)=0
2cosx-1=0
cosx=1/2
x=π/3,5π/3
..
cosx+1=0
cosx=-1
x=π
..
ans:
x=π, π/3, 5π/3
RELATED QUESTIONS
please help me solve this equation sin... (answered by longjonsilver)

Can you please help me solve this trigonometric identities question: 1)Prove the... (answered by alicealc)

Can you please help me solve this trigonometric identities question: 1)Prove the... (answered by stanbon)

Can you please help me solve this trigonometric identities question: 1)Prove the... (answered by jsmallt9)

Please Help me solve this equation: {{{sqrt(1-cosx)/sqrt(1+cosx)= (1- cosx)/... (answered by Alan3354)

Can you please help me simplify this: (cosx)/(1-tanx) +... (answered by Alan3354,MathTherapy)

Can you help me solve this problem: simplify... (answered by Alan3354)

Can you help me solve this trigonometric identities question: 1)Prove each of the... (answered by HyperBrain)

please help me solve this equation cosx + sqrt 3sinx = -1 (answered by Alan3354,greenestamps)