factorise (9x^2-1)-(1+3x^2)^2
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(9x^2-1)-[(1)^2+2 (1)(3x^2)+(3x^2)^2
=(9x^2-1)-(1+6x^2+9x^2)
=9x^2-1-1-6x^2-9x^2
= -2-6x^2
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=(9x^2-1)-(1+6x^2+9x^2)
=9x^2-1-1-6x^2-9x^2
= -2-6x^2
plz mark it brainliest. plz mark it brainliest
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