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I would suggest knowing how to use the equations and how to derive them. Though we may not be asked on an exam how to derive a equation, understanding where an equation comes from will help you know how and when to use it.
You don't necessarily have to know the steps on how to derive the equation, but it would be helpful to know where the equation comes from so that you can be able to interchange between equations if you needed to, and also so that you can understand the equation and know when it can be applied.
I think its essential to know that the vant hoff equation relates temperature to the equillibrium constant and you get this by setting the two gibbs free energy equations equal to each other. always think critically about which information you are given and therefore which equation would be the best to solve for what you need. this derivation is not hard so do not overthink this.
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