$\left(8x+4y\right)\left(8x-4y\right)$
$-x<5$
$\left(3x+2y\right)^2=9x^2+12xy+4y^2$
$6a^2-45ab-15b^2$
$\lim_{x\to0}\left(8xln\left(3x\right)\right)$
$12\left[x+2\right]^2=48$
$\int\cos^2\left(kx\right)dx$
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