$-\frac{j}{2}+7=-12$
$\left(5x^3+3x^2-3x+4\right)\left(-4x^3+2x-6\right)$
$\tan\left(x\right)\cdot\cos\left(x\right)+3\sin\left(x\right)$
$\lim_{x\to0}\:\:\frac{8x\left(cos\left(3x\right)-1\right)}{sin\left(2x\right)-2x}$
$\frac{7}{tan^2x+1}$
$\lim_{x\to0}\left(\frac{sin^2at}{cosat-1}\right)$
$4m^3n^{-2}\cdot3m^6n^4$
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