f) \(\left(6x+5y\right)\left(6x-5y\right)=36x^2-25y^2\)
g) \(\left(-4xy-5\right)\left(5-4xy\right)=-\left(5+4xy\right)\left(5-4xy\right)=-\left(25-16x^2y^2\right)=16x^2y^2-25\)
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