xsinθ - ysinθ = √(x^2+y^2)
cos^2θ/a^2 + sin^2θ/b^2 = 1/(x^2+y^2)
not sure what you mean by the "correct relation" We can solve for θ or solve for x and y.
(x-y)^2 sin^2θ = x^2+y^2
so, sin^2θ = (x^2+y^2)/(x-y)^2 and we have
(1-((x^2+y^2)/(x-y)^2))/a^2 + ((x^2+y^2)/(x-y)^2)/b^2 = 1/(x^2+y^2)
I don't know how you want to massage that, but it will remain messy, I'm sure.
I suspect a typo, since you have sinθ twice in the first line. I'd expected a cosθ there somewhere.
Xsin(theta)-Ysin(theta)=sqrtX^2+Y^2 and cos^2(theta)/a^2+sin^2(theta)/b^2=1/X^2+Y^2 then find correct relation
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