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## Homework Statement

Let h(t) = tan(3t+7)

Find h'(t) and h''(t)

I found h'(t) which is equal to 3(sec(3t+7))^2

But I can't seem to find h''(t)

How do I find the derivative of this? Could someone please teach me?

Is it a composition function? If it is, I think I see 4 functions.

Thanks in advance.