Solve the equation: 2sin(theta)=sin(theta)

Question

A video response would be nice but either way is fine.

Answer 1

2sinx=sinx

sinx=0

x=arcsin0=

0 +180n degrees

where n= any integer

or

0+pin radians

where n = any integer

Answer 2

2 sin θ = sin θ

2 sin θ - sin θ = 0

sin θ = 0π

θ = π + kπ, k ∈ Z