Determine the real number $k$ with the condition that the roots of the equation $x^ {4}-(3k+2) x^ {2} +k^ {2} =0$ make the arithmetic progression?
I dont know how to start ?
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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