Substitute the product of k 1k2 into Equation 2 and then square Equation 2.

Substituting the product term of k 1k2, we can get the expression of k 1k 2+K2 2.

Then square 1.

different

k 1^2+k2^2

And k 1k2.

Or k 1-k2 can be expressed by formula 2.

Then the square of 1 x2 * (k1-k2)-2y = (k1-k2) 2/(k1-k2) = (k1-k2).

Just replace k 1-k2.