Consider the .

no, there are infinitely many answers! you were not given any bounds. the answers given are the general formulas for ALL solutions

and i have one more question:

in solving:

4cos^2x-3=0

i get +- sqrt. 3/2

this means that there are 4 answers, but in the book, it gives me 2 :

pi/6+npi and 5pi/6+npi

why?

thanks