Week 2 Assg 2 Exercise 5, Invalid syntax in BACKWARD PROPAGATION

why i’m getting this error, i think equation code is fine. someone help me with this. i got stucked here

{moderator edit - solution code removed}

The parens don’t match on the previous line that computes the cost. You are missing a close paren. Note that the editor in the notebook is “syntax aware”, so you can use it to check your parens. Just click on one of them and watch what happens.

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Yes. i left with parens. very thanks @paulinpaloalto