A mathematician told me that the notation $\sqrt{a+bi}$ isn't used, instead we use $w=z^2$ and substitute. Is this correct? If yes, is there any particular reason we don't want imaginary numbers under a root sign?
How to find $\lim_{h\rightarrow 0}\frac{\sin(ha)}{h}$ without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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