anonymous
  • anonymous
Is this correct? Solve the equation on the interval of \( 0\geq \theta < 2\pi \) \( 2cos \theta + 3 = 2 \) \( 2 cos \theta = 2-3 \) \( 2 cos \theta = -1 \) \( \frac{2 cos \theta}{2} = \frac{-1}{2} \) \( cos \theta = \frac{-1}{2} \) This was on my midterm and I made an A on it but this one I got wrong but this looks correct? What did I do wrong?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Solve the equation on the interval of \( 0\geq \theta < 2\pi \) \[ \huge 2\cos \theta + 3 = 2 \] \[ \huge 2 \cos \theta = 2-3 \] \[\huge 2 \cos \theta = -1 \] \[ \huge \frac{2 \cos \theta}{2} = \frac{-1}{2} \] \[\huge \cos \theta = -\frac{1}{2} \]
Curry
  • Curry
wait how many answers did you provide? there are two answers.
anonymous
  • anonymous
One sec it should be \(\huge 0\leq \theta < 2\pi \)

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anonymous
  • anonymous
I provided one
anonymous
  • anonymous
but if we work out the equation, like I did, it comes to what I have
TheSmartOne
  • TheSmartOne
You need to solve for \(\sf\theta\)
anonymous
  • anonymous
Ok so he wanted the angle
TheSmartOne
  • TheSmartOne
Yes, and you should get 2 answers for the angle
anonymous
  • anonymous
Yes I get two. I was thinking he just wanted us to do it like that because some of our homework does it like I just did it.
TheSmartOne
  • TheSmartOne
What 2 angles did you get? :)
DanJS
  • DanJS
cos(a) = x on the unit circle with radius 1... picture that thing
anonymous
  • anonymous
I got 120 and 240 degrees. or 2pi/3 and 4pi/3
TheSmartOne
  • TheSmartOne
|dw:1435870657418:dw|
TheSmartOne
  • TheSmartOne
Correct :)
anonymous
  • anonymous
Yep that is it :-) Just a silly mistake on my part :-( oh well lol
anonymous
  • anonymous
Got the hardest one right because I put the angle lol
TheSmartOne
  • TheSmartOne
If they didn't have the restrictions on the value of \(\sf\theta\) then the answer would be: \(\sf\Large \theta=\frac{2\pi}{3}\pm2\pi n\) \(\sf\Large \theta=\frac{4\pi}{3}\pm2\pi n\)
anonymous
  • anonymous
Funny, I made the same mistake on two but for some reason, on the hardest one I put the angle for that one but not the other two.... . DUFF what was I thinking lol
anonymous
  • anonymous
Anyways... I still have an A in the class and I made an A on the midterm so I am happy :-)
TheSmartOne
  • TheSmartOne
(-:

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