Veksel utregning

$\left({\frac {1}{2}}\right)$

$(r+x)^{2}+(R-x)^{2}-(R-r)^{2}-2(r+x)(R-x)cos(\alpha )=0$
$R(r(1-cos(\alpha ))-x(1+cos(\alpha )))+x\cdot (1+cos(\alpha ))(r+x)=0$
$R\left(r\cdot \left({\frac {1-cos(\alpha )}{1+cos(\alpha )}}\right)-x\right)+x\cdot (r+x)=0$

$(1-cos(\alpha )$