$\begin{aligned}
& f(x)=\int_0^{x^2} \frac{t^2-8 t+15}{e^t} d t, x \in R \
& f^{\prime}(x)=\frac{x^4-8 x^2+15}{e^{x^2}}(2 x)=0 \
& \Rightarrow \quad \frac{2 \times\left(x^2-5\right)\left(x^2-3\right)}{e^{x^2}}=0 \
& \Rightarrow x(x+\sqrt{5})(x-\sqrt{5})(x+\sqrt{3})(x-\sqrt{3})=0
\end{aligned}$ By using wavy curve method 
Number of local maximum =2 Number of local minimum =3