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the interval is 0( which is less than or equal to) theta ( which is less than) 2pi

-2cos(x) = 1
cos(x) = -1/2
the related angle is cos inverse of 1/2 , which is 60 degrees

cos is negative in the 2 and 3 quadrants

x= 180 -60 and x= 180 + 60
x= 120 , 240 degrees

\[\frac{2\pi}{3} , \frac{4\pi}{3} \] in radians

thanks. but the answer seems to be wrong? not sure why

I am fairly sure what I did was correct

could it be because the question says round the answer to two decimal points in radians?

yes lol :|

obviously if you entered the exact values then they wouldnt like it

I assumed you would know how to convert the exact values into radians, lol, just calculator work

yes, however i dont have a calc lol! i think the first one is 2(3.14)/3 ?

I use it to check my answers

ok thanks. but to be 100% sure(kind of forgot) radians is using pi as 3.14?

yes approx that ,

thanks mate. got it right!

would you also be able to show me how to do the question just above this question?