Sin2x-sin4x=0.как решать?:)
sin4x=2sin2xcos2x
sin2x(1-2cos2x)=0
sin2x = 0 or cos 2x = 1/2
sin 2x = 0: x=p/2*k, k in Integers
cos 2x = 0: 2x = pi/2+pi*n, n in Integers
x=pi/4 + pi*n/2, n in Integers.
Ответ: x=p/2*k, k in Integers or x=pi/4 + pi*n/2, n in Integers.