How can I fix cracks in a large concrete patio?

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I have a large concrete patio that has unsightly cracks in it. I have tried several remedies but nothing seems to stay for very long. I pressure wash it every Spring to remove dirt and mildew. I even stained it but that didn't last very long. The house was built in the late 60's or 70's and I assume patio was built at that time. We have had several earthquakes and each time there seems to be a new crack or the old ones get longer.

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