Какое из равенств является тождеством:
1) (y-x)(x-y)= -2xy
2) (y-x)(x-y)= (y-x)^2
3) (y-x)(x-y)= y^2-x^2
4) (y-x)(x-y)= -(x-y)^2
^ - значок "в квадрате"
плиз, с объяснением ​
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