If $\mathrm{A}(2, c)$ and $\mathrm{B}(d, 2)$ are two points such that the polar of one point with respect to…
If $\mathrm{A}(2, c)$ and $\mathrm{B}(d, 2)$ are two points such that the polar of one point with respect to the circle $x^2+y^2=16$ passes through the other, then $c+d=$