jika tan theta=2/5 nilai sin (phi/2-theta)=

Nilai fungsi trigonometri

tan θ= 2/5 --> misal tan θ= y/x
r = √(x²+y²) = √(5²+2²) = √29

sin (π/2 - θ) = cos θ = x/r = 5/√29 = ⁵/₂₉ √29