1) 2 sin23x – 3sin3x + 1 =0;
-1sin20x + 1 = 0
-1sin20x = 0-1
-1sin20x = -1
sin x = -1 / (-1)
sin x = 1
1) 2 sin23x – 3sin3x + 1 =0;
-1sin20x + 1 = 0
-1sin20x = 0-1
-1sin20x = -1
sin x = -1 / (-1)
sin x = 1