Statement 2, now I got what you meantJust to confirm:
sin(x) - sin(x) * cos2(x) = sin2(x) .........................................(1)
or
sin(x) - sin(x) * cos2(x) = sin3(x) .........................................(2)
Which one is correct
(exactly how be it was from the source) - statement (1) or (2)?