bagaimana cara nya tolong di bantu

tan x = 1/2
tan x = depan/samping
depan = 1
samping = 2
miring = √(1² + 2²)
miring = √5

sin x = depan/miring
sin x = 1 / √5

2 sin x + sin ( x + 1/2 . μ) + cos (μ - x)
= 2 sin x + cos x - cos x
= 2 sin x
= 2 . 1/√5
= 2/5 . √5 ..............C