Розрахунок: k7xXRp - 1

2* h+n+cos(β) =
k+λ

2* h+n+cos(β) = k+λ $2\cdot h+n+cos(\beta)$ = $k+\lambda$

2* h = k+λ-n-cos(β) $2\cdot h$ = $k+\lambda-n-cos(\beta)$

h =

(k+λ-n-cos(β))

/ 2

$h$ = $\frac{k+\lambda-n-cos(\beta)}{2}$

h = 0.5* k+ 0.5* λ- 0.5* n- 0.5* cos(β) $h$ = $0.5\cdot k+0.5\cdot \lambda-0.5\cdot n-0.5\cdot cos(\beta)$