\(\hphantom{}= \hphantom{}\)=\(\hphantom{}-1\)−1
y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax y=ax
