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<Pf.>
=<a_x, a_y>¡Ñ[<b_x, b_y>+<c_x, c_y>]
=<a_x, a_y>¡Ñ<b_x+c_x, b_y+c_y>
=a_x<b_x+c_x>+a_y<b_y+c_y>
=a_xb_x+a_xc_x+a_yb_y+a_yc_y
=<a_xb_x+a_yb_y>+<a_xc_x+a_yc_y>
=<a_x, a_y>¡Ñ<b_x, b_y>+<a_x, a_y>¡Ñ<c_x, c_y>
=