Verify the first special case of the chain rule for the composition f∘c in each of the cases:
(a) f(x,y)=xy,c(t)=(et,cost)
(b) f(x,y)=exy,c(t)=(3t2,t3)
(c) f(x,y)=(x2+y2)log√x2+y2,c(t)=(et,e−t)
(d) f(x,y)=xexp(x2+y2),c(t)=(t,−t)

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