Maths urgent question plllzzzzzzzzzzzzzzz

the reduced form of

COS^6 X + SIN ^ 6 X + 3 COS^2 X SIN ^2 X is equal to

A) 2
B ) 0
C) sin^3X + cos^3X
D) 1

1

If you look you can see it all cancels out so the answer is zero (B)

D

C

d)1