$($d$)$ Verify the following general relation:

$$volts

Calculate: $(100$ points$)$

$($a$)$ the sequence components of the line$-$to$-$ground voltages, denoted $(25$ points$)$;

$($b$)$ line$-$to$-$line voltages $(25$ points$)$; and

$($c$)$ sequence components of the line$-$to$-$line voltages $(25$ points$).$

$($d$)$ Verify the following general relation:

$$volts