-sin2x+sinx=0 какие иксы будут?

-sin(2x) + sin(x) = 0

-2sin(x)cos(x) + sin(x) = 0

sin(x)*(-2cos(x) + 1) = 0

sin(x) = 0 --> x = πk

cos(x) = 1/2 --> x = ±π/3 + 2πk

Ответ: πk, ±π/3 + 2πk, k - целое.