>>215
x(t)=(1+(1/2)cos(24t))cos(t)
y(t)=(1+(1/2)cos(24t))sin(t)
0≦t≦2π
0≦r≦1+(1/2)cos(24t)
∫∫ dxdy = ∫∫ rdrdt = ∫ [r^2/2] dt = ∫ (1+cos(24t)/2)^2/2 dt
= ∫ (1/2+cos(24t)/2+cos^2(24t)/8) dt = ∫ (1/2+cos(24t)/2+(1+cos(48t))/16) dt
= ∫ (1/2+1/16) dt