$\left(3-7k\right)\left(-2\right)+6k-10$
$\sec x\left(1-\cos x\right)=\sec x-1$
$4ab-5ab+ab$
$8x^2+x$
$k^2+6k+9$
$\frac{d}{dx}ln\left(x\right)^{8x}$
$-2.8+45.3$
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