Find `t` for the following terminal points, `0 le t lt 2pi`

(a) ` P(0,1) `, `t=`   ;
(b) ` P(-\frac(\sqrt(2))(2),\frac(\sqrt(2))(2)) `, `t=`   ;
(c) ` P(-1,0) `, `t=`   ;
(d) ` P(-\frac(\sqrt(2))(2),-\frac(\sqrt(2))(2)) `, `t=`   ;
(e) ` P(0,-1) `, `t=`   ;
(f) ` P(\frac(\sqrt(2))(2),-\frac(\sqrt(2))(2)) `, `t=`   .