$\left(5x^6-x^2+5x\right)-\left(-3x^6-5x^2\right)$
$r+r+r+r$
$\frac{dy}{dx}\cos\left(y\right)+\cos\left(x\right)$
$k^2-4kx+4x^2$
$\left(7\right).\left(-3\right)-27$
$2\left(7x^2+b-1\right)$
$t^2-12t+32$
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