https://vtuupdates.com/solved-model-papers/solve-%f0%9d%91%a52-%f0%9d%91%a62-%f0%9d%91%a5%f0%9d%91%91%f0%9d%91%a5-%f0%9d%91%a5%f0%9d%91%a6%f0%9d%91%91%f0%9d%91%a6-0/
Solve (𝑥2 + 𝑦2 + 𝑥)𝑑𝑥 + 𝑥𝑦𝑑𝑦 0