(2-x)(2+x)-(x-3)²
4-x²-(x²-6x+9)
4-x²-x²+6x-9
-5-2x²+6x
-2x²+6x-5
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(2-x)(2+x)-(x-3)²
4-x²-(x²-6x+9)
4-x²-x²+6x-9
-5-2x²+6x
-2x²+6x-5