"square bracket"? Is your keyboard defective, so you can't just type "[" ?
Even more confusing is that you didn't use what I gave you at
http://www.jiskha.com/display.cgi?id=1468255629
approximate the solutions (to three decimal places) of the given equation in the interval
square bracket 0, 2π)
sin 2x + 1.5 cos x = 0
1 answer