a) Read these threads: http://www.mathhelpforum.com/math-he...roof-help.html, http://www.mathhelpforum.com/math-he...-equation.html
b) Substitute z = x + iy and simplify.
a) Read these threads: http://www.mathhelpforum.com/math-he...roof-help.html, http://www.mathhelpforum.com/math-he...-equation.html
b) Substitute z = x + iy and simplify.