3. Derive the following convolutions from Convolution Pair #12:

* x² + ²[{²e¹ — ¿cos(@x) + asin(ex)]}u(t)

1

2² +0²

cos(x)u(t)* e¹u(t)=

sin(at)u(t)* e* u(t)

= [@xx³¹ – acos(at) — 2 sin(ext) Ju(t)