Help regarding property of unit impulse function We know that using properties of unit impulse function it can be shown that 

$$\int_{t_1}^{t_2} x(t) \delta^{(n)}(t-t_0) dt=(-1)^nx^{(n)}(t_0),\quad t_1&lt;t_0&lt;t_2$$ (source: Continuous and Discrete Signals and Systems- Soliman)

But what would be the case for the problems like these
$$\int_{-1}^{2}(3t^3+9)\delta''(t+1) dt$$

I've tried in this way:

$$\int_{-1}^{2}x(t)\delta''(t+1) dt=\\ \big[x(-1)\delta'(t+1)-x'(-1)\delta(t+1)\big]_{-1}^{2}-\int_{-1}^{2}x'(t)\delta'(t+1)dt$$

can't figure out the first part inside the third bracket.
Integrals of the form

$$\int_{a}^bf(t)\delta^{(n)}(t-a)dt\tag{1}$$

with $\delta^{(n)}(t)$ being the $n^{th}$ generalized derivative of the Dirac delta impulse, are undefined. What is well-defined are integrals of the form

$$\int_{a^+}^bf(t)\delta^{(n)}(t-a)dt\tag{2}$$

or

$$\int_{a^-}^bf(t)\delta^{(n)}(t-a)dt\tag{3}$$

In $(2)$, the Dirac impulse (or its derivative) is outside the integration interval and, consequently, the integral evaluates to zero, whereas in $(3)$ $\delta^{(n)}(t-a)$ is inside the integration interval and the value of the integral is given by the first formula of the question.