Fix equation for Weierstrass form #4
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This fixes the calculation for the Weierstrass form from `x^3 + ax^2 + b` to the correct form `x^3 + ax + b`. The issue does not appear for secp256k1 since there `a = 0`. However it appears when trying to use this code for other curves.
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This fixes the calculation for the Weierstrass form from
x^3 + ax^2 + bto the correct formx^3 + ax + b. The issue does not appear for secp256k1 since therea = 0. However it appears when trying to usethis code for other curves.