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(2+3x)^-2
(2+3x)^2=4+12x+9x^2
(2+3x)^-2=2^2+2(2+3x)+3x^2=4+4+6x+9x^2=9x^2+6x+8
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(2+3x)^2=4+12x+9x^2
(2+3x)^-2=2^2+2(2+3x)+3x^2=4+4+6x+9x^2=9x^2+6x+8