<|system|>
Evaluate $\left(\dfrac{-2i}{5}\right)^2$.</s>.
<|user|>
Can you answer based on context?
<|assistant|>
$\left(\dfrac{-2i}{5}\right)^2 = \left(\dfrac{(-2i)^2}{5^2}\right) = \left(\dfrac{(-2)^2i^2}{25}\right) = -\dfrac{4}{25}.$