$\sin^2a-\sin^2a\cos^2a$
$\left(2m-6\right)\left(2m-4\right)$
$16x^8-46x^5y+64x^2y$
$\left(10y^3+7\right)^2$
$-3\cdot1+1$
$8\left(-4d\right)$
$6n^2-7n^2$
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