如图,已知△ABC,求作一点P,使P到∠A的两边的距离相等,且PA=PB。(不用写作法、但要保留作图痕迹)
(a2-4a+4)-c2
m2+2n-mn-2m
(a2+1)2-4a2
5m(x-y)2+10n(y-x)3
-8ax2+16axy-8ay2