How to prove $ |\langle u,v\rangle| \leq \|u\|\|v\|$

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How to prove $ |\langle u,v\rangle | \leq \|u\|\|v\|$

Note: I have given this many attempts so don't downvote due to lack of effort, refer to edit history for evidence of said effort

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Your $$\sqrt{\sum_{i=1}^n u_i u_i} \sqrt{\sum_{i=1}^n v_i v_i} = \sqrt{\sum_{i=1}^n u_i^2 v_i^2}$$ and $$ \sqrt{\sum_{i=1}^n u_i^2 v_i^2} = \sum_{i=1}^n u_i v_i$$ are both wrong.