$2\left(xy\right)^28x^3$
$\cos^2x-\cos x=2$
$2\left(7\right)\:-\:3^2$
$-40\cdot5$
$\frac{dy}{dt}=\frac{1+t^{2}}{t}$
$a^2+7a-6$
$\left(\tan\left(x-1\right)\right)\left(\sqrt{3}\tan\left(+1\right)\right)=0$
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