$\left(-7980\right)-\left(+3590\right)$
$5\cos^2+\cos=0$
$4b-5\left(-3b+8\right)$
$\left(\frac{2}{3}x+\frac{1}{4}y\right)\left(6x-7y+12\right)$
$\int24x^2.\cos^4x^3dx$
$-e^{-x}\cdot\:2e^{-x}$
$\left(-3+8\right)-\left(2-5\right)$
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