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# Maths c2 help watch

1. Solve (1+cosx)^2=1/2 for -180 <x <180
2. (Original post by ramshahk)
Solve (1+cosx)^2=1/2 for -180 <x <180
How would you isolate the cosx term?
3. (Original post by an_atheist)
How would you isolate the cosx term?
Square root it? Im not sure
4. (Original post by ramshahk)
Square root it? Im not sure
Yes. You square root it.
5. (Original post by an_atheist)
Yes. You square root it.
Then
6. (Original post by ramshahk)
Then
What do you think? Write it out.
7. (Original post by an_atheist)
What do you think? Write it out.
Yes I've done that
8. (Original post by ramshahk)
Yes I've done that
And what are you left with?
9. (Original post by an_atheist)
And what are you left with?
1+cos= square root 1/2
10. (Original post by ramshahk)
1+cos= square root 1/2
And how do you isolate cosx from there?
11. I would expand the bracket, then bring the 1/2 to the other side and put the equation =0. You then have a quadratic to solve

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