\(36a^4-y^2=\left(6a^2\right)^2-y^2=\left(6a^2-y\right)\left(6a^2+y\right)\)
\(6x^2+x-2=6x^2-3x+4x-2=3x\left(2x-1\right)+2\left(2x-1\right)=\left(2x-1\right)\left(3x+2\right)\)
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