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How to graphically find t1 for which cost function is minimized?

How to graphically find t1 for which cost function is minimized? Correct Answer Plot J(t1) against t1 and find minima

At the minima of the graph obtained by plotting J(t1) against t1, we have the minimal value of J(t1) for the given dataset, using linear regression. This is the desired cost function. So, we take this value of t1 and use it in the final hypothesis.

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