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trigonometric equation help!!!!!
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I'm struggling on this question, someone pleaseee help me ;
2sin2θ+1=0
for 0∘≤θ≤360∘ are θ=
i got θ= 30, 120,210, 330 ; and got it wrong.
2sin2θ+1=0
for 0∘≤θ≤360∘ are θ=
i got θ= 30, 120,210, 330 ; and got it wrong.
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#2
(Original post by prs33)
I'm struggling on this question, someone pleaseee help me ;
2sin2θ+1=0
for 0∘≤θ≤360∘ are θ=
i got θ= 30, 120,210, 330 ; and got it wrong.
I'm struggling on this question, someone pleaseee help me ;
2sin2θ+1=0
for 0∘≤θ≤360∘ are θ=
i got θ= 30, 120,210, 330 ; and got it wrong.
Post your working for feedback.
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(Original post by Plücker)
Judging from your answers you have made more than one mistake.
Post your working for feedback.
Judging from your answers you have made more than one mistake.
Post your working for feedback.
i really need help
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#4
(Original post by prs33)
From; 2sin2θ+1=0 i tried to solve it to sinθ+1/2=0 so sin-1(1/2)=30 so for my values I did 90+30=120, 180+30=210 , 360-30=330
i really need help
From; 2sin2θ+1=0 i tried to solve it to sinθ+1/2=0 so sin-1(1/2)=30 so for my values I did 90+30=120, 180+30=210 , 360-30=330
i really need help
Your next step is also incorrect. You need the inverse sine of both sides but only after you have isolated the sin term.
Subtract 1/2 from both sides then take the inverse sine.
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(Original post by Plücker)
You can divide by 2 but this will not change the angle. The correct equation would then be
Your next step is also incorrect. You need the inverse sine of both sides but only after you have isolated the sin term.
Subtract 1/2 from both sides then take the inverse sine.
You can divide by 2 but this will not change the angle. The correct equation would then be
Your next step is also incorrect. You need the inverse sine of both sides but only after you have isolated the sin term.
Subtract 1/2 from both sides then take the inverse sine.
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#6
(Original post by prs33)
so it would be sin-1(-1/2)= -30 *2= -60 ??
so it would be sin-1(-1/2)= -30 *2= -60 ??
What's the next step?
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#8
(Original post by prs33)
ohhh , so θ= -15 ?
ohhh , so θ= -15 ?
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