Question

Which of the following is not equuivalent to
(Sinx-1)^2(sinx+1)
a. cos^2(x)-cos^2(x)sin(x)
b. 1-sin(x) / sec^2(x)
c. cos^4(x) / 1+sin(x)
d. cos^2(x)(1-sin(x))
e. 1+cos^2(x) / sin(x)