Find the values ofa,b,c, anddif the equations trace out the circles shown below.

x = a + bcos(t) , y = c + dsin(t) , 0<_t<_2pi

C1:

a=

b=

c=

d=

C2:

a=

b=

c=

d=

C3:

a=

b=

c=

d=

i need some help with this one...mainly on how to find the different values that it is asking for...thanks...

mer1988