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[" 16.If "x=r cos theta,y=y sin theta," ...

[" 16.If "x=r cos theta,y=y sin theta," prove that "],[[" (a) "(del^(2)r)/(del x^(2))+(del^(2)r)/(del y^(2))=(1)/(r)[((del r)/(del x))^(2)+((del r)/(del y))^(2)],[" (c) "((del r)/(del x))^(2)+((del r)/(del y))^(2)=1]]

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