Question $4(20$ Marks$)$

$($a$)$ Express the following points in Cartesian coordinates:

i$.P(1,60,2).$

$(4$ marks$)$

ii$.Q(2,90,-4).$

$(3$ marks$)$

iii. $T(4,\frac{}{2},\frac{}{6}).$

$(8$ marks$)$

$($b$)$ Express the point $P(1,-4,-3)$ in cylindrical and spherical $(5$ marks$)$

coordinates.