Question

Find all the solutions in the interval [0,2pi) of the equation 3cos^2 x + cosx =1

Answer 1

start with the substitution
\(\cos x=u\)
you'd now have
\(3u^2+u-1=0\) <----- good till here?
solve it for two values of "u"
then replace "u" by cosine and find "x"
kapeesh?

Answer 2

im still not getting it @electrokid

Answer 3

do you understand till the part maked?

Answer 4

yes @electrokid

Answer 5

good.
then you can do the part right below it and find the two values of "u"?