hey guys i'm having trouble on these things.(adsbygoogle = window.adsbygoogle || []).push({});

ok here it is f(t):3cos^2(5t), the domain is [-pi/5,pi/5].

I have to find the concavity and where the curve increases and decreases. I took the second derivative and got the inflection point at .157.

I have no idea where i am going wrong but i am. please help me out.

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# Can you help me on this

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