1)
What is "k'Chasdecha"?
1.
Radak: Like Your Chesed was with me many times, so do now.
2)
What is the connection of the two halves of the verse?
1.
Radak: Since You will save me from Zedim, I can engage in Your Chukim, and You will teach me and help me to understand them.
2.
Malbim: Chukim are hidden matters, and secrets of the King of the world. Based on letter of the law, You need not teach them to me. Do so amidst Chesed!