I
ironman2


Giải phương trình:
1.4cos(5x/2)cos(3x/2) + 2(sin8x-1)cosx=5
2.sin(x/2)sinx-cos(x/2)sin^2x+1=2cos^2x(pi/4-x/2)
1.4cos(5x/2)cos(3x/2) + 2(sin8x-1)cosx=5
2.sin(x/2)sinx-cos(x/2)sin^2x+1=2cos^2x(pi/4-x/2)