a) (i) Find the coordinates of the centre and radius pf a circle x^2+2x+y^2-4y

(ii) By writing x+1=3 sinteta, show that the parametric equation of this circle are x=-1+3sinTeta, y=2+3Costeta.

(iii) Show that the coordinates of a point of intersection this cirle with the line x+y=1 are x=-1+or- 3/2 squaroot 2.

b) find the general solution of the equation costeta=2sin^2teta-1

Need help! aint sure how tew get start on thiss one...already started but it seem to be wrong. so can u guys please help me..it will be greatly appreaciated