I am confuse with this:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]Let\;\; t=jx \;\;,\;\; j =\sqrt{-1}[/tex]

[tex] \Rightarrow \frac{dt}{dx}=j[/tex]

But if I use [tex]t^2=-x^2 \;\Rightarrow\; 2t\frac{dt}{dx}=-2x[/tex]

[tex]\Rightarrow \frac{dt}{dx}=-\frac{x}{t}[/tex]

What is wrong?

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# Question of differentiation

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