Sin2xcos2x= -1/4 pomogite
sin2xcos2x=-1/4 2•sin2xcos2x=-1/4*2 sin4x=-1/2 4x=(-1)^narcsin(-1/2)+πn 4x=(-1)^(n+1)arcsin1/2+πn 4x=(-1)^(n+1)•π/6+πn x=(-1)^(n+1)π/24+πn/4;n€Z