radicals - How do I get the square root of a complex number? - Mathematics Stack Exchange
Complex Numbers Calculator (The Square Root of -1 is not NaN) « Alcula's Online Calculators' Blog
Imaginary Numbers and Negative Square Roots. The imaginary number i is the square root of -1: Example: Evaluate (3 i) 2 Imaginary Numbers. - ppt download
Complex Number Calculator • حاسبات الرياضيات • محولات الوحدات عبر الإنترنت