Find the area of the surfaces.
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1.)The part of the hyperbolic paraboloid z= y^2 - x^2 that lies between the cylinders x^2 + y^2 = 1 and x^2 + y^2 = 4
2.)The part of the sphere x^2 + y^2 + z^2 = a^2 that lies within the cylinder x^2 + y^2 = ax and above the xy-plane
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