If $P(t) = (\cos t, \sin t)$ has coordinates (0.789,0.614), find the coordinates of

a. $P(t+ \pi)$
$x$ = $y$ =

b. $P(- t)$
$x$ = $y$ =

c. $P(t- \pi)$
$x$ = $y$ =

c. $P(- t- \pi)$
$x$ = $y$ =

Your overall score for this problem is