Question
Normally, the condition that $a$ and $b$ both equally zero can be described by ............ .
$
\left(a^2-b^2 \neq 0, a^2+b^2 \neq 0,-a^2+b^2 \neq 0\right)
$
$
\left(a^2-b^2 \neq 0, a^2+b^2 \neq 0,-a^2+b^2 \neq 0\right)
$
✓
Answer
$a^2+b^2 \neq 0$
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