factorise 25x^2+36y^2+81z^2+60xy-108yz-90xz
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a^2+b^2+c^2+ab +BC +ca
5x^2+6y^2+(-9z^2)+5x(6y)+6y(-9z)+5x(-9z)
so,(5x^2+6y^2-9z^2)^2
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