$7\cos\left(w\right)-4\sin^2\left(w\right)+2$
$x^4-6x^2+9$
$2w^2+2w-4$
$4y'-4e^{2x}y=0;y\left(0\right)=1$
$\frac{dy}{dx}=ycos5x$
$\frac{a^9}{a^3}$
$\frac{4^4.27^2.8^3.81^2}{16^2.27^5.4^69^1}$
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