+129852 sin^4x - sin^2xcos^2x -cos^4x
sin^4x - (1 - cos^2x)cos^2x - cos^4x
sin^4x - cos^2x + cos^4x - cos^4x
sin^4x - cos^2x
Note : other answers may be acceptable....!!!
+895 Hey CPhill. Thanks for the answer, but you accidentally dropped the 2 on the cos4x.
