What is cis in complex numbers - the exact equation for


1) The number of real roots of of the equation (x-1)2 + (x-2)2 + (x-3)2=0

2) What is cis in complex numbers?

3) The value of sin (2sin-1(0.8)) is

4) The exact equation for short distance between two points. 

5) y = (sin-1(x))3 + (cos-1(x))3 = (arcsin3(x)) + (arccos3(x))

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