$a^2-149+49$
$\cos\left(4a\right)=2\cos^22x-1$
$36d^2-48+16$
$x^2dx=-y\left(x-1\right)dy$
$36m^2-12mn+n^2$
$x+x^3+x$
$\int\left(8x\left(4x^2-3\right)^6\right)dx$
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