Question

2.sen(2x)-senx=0 como se resolve?​

Answer 1

sen2x = 2senxcosx

2.2senxcosx - senx = 0

4senxcosx - senx = 0

senx(4cosx - 1) = 0

senx = 0 ou 4cosx - 1 = 0

x = 0 ou pi, 4cosx = 1

x = 0 ou pi, cosx = 1/4

x = 0 ou pi, x = arccos(1/4)