Question: I need help finishing this problem. After calculating the second derivative, which is 10+20sin(2x), I believe the next step is to set the 2nd derivative

I need help finishing this problem. After calculating the second derivative, which is 10+20sin(2x), I believe the next step is to set the 2nd derivative to zero and solve for x. I did that and got 7pi/12 and 11pi/12. What would be the best approach to determine the sign of f"(x) for each interval? To be more specific, I have no idea how to test the interval between 11pi/12 and pi, so clearly I am missing something obvious.

Thanks!

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