just4me:
p=9, q=5;//0.87415727612153776266204080356394 | 0.48564293117863209036780044642441
r=1/(pp+qq);//0.09712858623572641807356008928488
x=pa-qb;

y=qa+pb;

a=(px+qy)r;

b=(-qx+py)r;

279292043s ago, by Antonio

just4me:p=9, q=5;//0.87415727612153776266204080356394 | 0.48564293117863209036780044642441r=1/(p*p+q*q);//0.09712858623572641807356008928488x=p*a-q*b; y=q*a+p*b; a=(p*x+q*y)*r; b=(-q*x+p*y)*r;