$\left(x+a\right)^2\left(x-a\right)^2$
$20a+a^2-21a$
$\sin\left(x-\pi\right)=\sin\left(x\right)$
$\frac{4}{9}y^2-16b^6$
$x\frac{dy}{dx}+4y=1-\frac{5}{x}$
$2tan\:y+sec^2y$
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