Expression 7: negative log left parenthesis, abs left parenthesis, "p" Subscript, "i" , Baseline left parenthesis, "x" , right parenthesis minus pi , right parenthesis , right parenthesis Has graph. To audio trace, press ALT+T.−logabspix−π
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complex calculus: Im( (x+iy)^n )
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Expression 9: "P" Subscript, "i" , Baseline left parenthesis, "y" , "x" , "n" , right parenthesis equals left parenthesis, StartRoot, "x" squared plus "y" squared , EndRoot , right parenthesis Superscript, "n" , Baseline sine left parenthesis, "n" times arctan left parenthesis, "y" , "x" , right parenthesis , right parenthesisPiy,x,n=x2+y2nsinn·arctany,x