Question

упростить:
1-с²-4с(1-с²)+4с²(1-с²)

Answer 1

$1-c^2-4c(1-c^2)+4c^2(1-c^2)=\\(1-4c-4c^2)(1-c^2)=(2c-1)^2(1-c)^2=[(2c-1)(1-c)]^2$