When I want to invest in a pool from MetaMask,

there is a small cost for the first transaction where curve.fi takes the money from my wallet. And then there is a more expensive transaction for depositing the tokens into pool. two questions: 1) why is the first one cheaper? 2) where exactly are my tokens between the two transactions - when they are taken from my wallet but they are not fully deposited into pool yet?

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the first tx (the cheaper one) is an approval tx

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