EEvaluate the following integrals: \text { (a) } \int_{-2}^{2}(2 x+3) \delta(3 x) d x \text { . } \text { (b) } \int_{0}^{2}\left(x^{3}+3 x+2\right) \delta(1-x) d x \text { .

} \text { (c) } \int_{-1}^{1} 9 x^{2} \delta(3 x+1) d x \text { . } \text { (d) } \int_{-\infty}^{a} \delta(x-b) d x \text { . }