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F(x+iy)= ix^2. Using the def. of derivative, Calculus 3 methods, show that if Re(a) not equal = 0 then f(z) is not differentiable at z=a.? X^2-22x+121=0? Does anyone know how to solve 3x=x^17 ? What city/state is closest to Illinois that doesn't reach freezing temperatures in the winter( even at night)? A signal with a 400 s period has a frequency of? Please explain your answer.?