$k^2+7k+12$
$\frac{d}{dx}5y-3x^{6x}$
$\frac{2\left(1-2\cos^2\left(x\right)\right)}{\sin\left(2x\right)}=\tan\left(x\right)-\cot\left(x\right)$
$\left(7x^2\right)^2+24\left(7x^2\right)+128$
$\left(4x-2\right)\cdot\left(4x+4\right)-\left(4x+3\right)^2$
$10^5\cdot10^{-5}$
$\left(t^2-4x^4\right)^3$
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