Find the area of the region enclosed by x2/a2+y2/b2=1x^2/a^2 + y^2/b^2 = 1x2/a2+y2/b2=1.
πab\pi abπab
πa2\pi a^2πa2
4ab4ab4ab
π(a+b)\pi(a+b)π(a+b)