N' =- LE TE (Pu cos 0 + tu sine) dsu + TE - (picos sin 0) dsi (1.7) A' = TE LE TE = (P₁ sine + T cos 0) dsu + (pi sin cos 0) ds (1.8) LE TE MLE = [(pu cos 0 + sin 0)x — (p, sin 0 - ™, cos 0)y] dsu + LE TE LE (pi cos 0 + 7, sin 0)x + (p, sin€ + t, cos€)y]ds{ (1.11) dyu dyi Cfl dx xp În = [ " ( C p.1 − C p. ) d x + f ( C 1, + C x ) dx] Сп i - (Cpl Cp.u) dx Cf.u dx (1.15) Ca dyi - Cp. dx +xp √ √ (Cf.u = [(CC) dx + (ca + c) dx] dyu C dx (1.16) dyu dyi xdx C = [(p − p)x dx = f ( x + c) x x CMLE + - dyu Cf.u dx dyi y • (C + c) dx + f (-C+c) dx] So Cp.u dx yu 10 xp (1.17)