CT Convolution: Solve the following convolution problems

a$)($u$($t$)-$u$($t$-2))*($u$($t$-1)-$u$($t$-3))$

b$)0\mathrm{.}5($u$($t$)-$u$($t$-2))*($u$($t$-1)-$u$($t$-2))$

c$)($u$($t$)-$u$($t$-2))*($delta$($t$+5))$

d$)($u$($t$)-$u$($t$-2))*($delta$($t$)+$ delta$($t$-1))$