Evaluate the surface integrals.
a) f(x,y,z)=(x^2+y^2)z; sigma is the portion of the sphere x^2+y^2+z^2=4 above the plane z=1
b) f(x,y,z)=x^2+y^2; sigma is the surface of the sphere x^2+y^2+z^2=a^2
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In the attachment I walk you through the first one --I'll leave the second for you
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