1) (9-3^0, 5x-7)log2(5-2x)=0
9 - 5x - 7 = 0
2 = 5x
x = 2/5
2) -cos( π+3x)sin x + sin 3x sin (3π/2-x)
-cos(π)cos(3x)sin(x) + sin(3x)sin(3π/2)cos(x)
(-1)(-cos(3x)sin(x)) + sin(3x)(-cos(x))
cos(3x)sin(x) - sin(3x)cos(x)
sin(3x - x)
sin(2x)
1) (9-3^0, 5x-7)log2(5-2x)=0
9 - 5x - 7 = 0
2 = 5x
x = 2/5
2) -cos( π+3x)sin x + sin 3x sin (3π/2-x)
-cos(π)cos(3x)sin(x) + sin(3x)sin(3π/2)cos(x)
(-1)(-cos(3x)sin(x)) + sin(3x)(-cos(x))
cos(3x)sin(x) - sin(3x)cos(x)
sin(3x - x)
sin(2x)