(7x-3)(2x-5) -2(4x-3)^2
14x²-35x-6x+15-2(4x-3)¹²
14x²-41x+15-2(4x-3)¹²
cos(4x)+2sin^2(2x)=(1-2sin(2x)^2)+2sin^2(2x)=1