$\frac{1}{4}a^4-2b^2$
$-4xy\:;\:\:\:y=-2$
$\frac{d}{dx}\left(x^2+y^4=5xy^2\right)$
$\cos^2x-\frac{3}{4}=0$
$\frac{dy}{dx}=\frac{2y^3+y}{x\left(1-2y^2\right)}$
$\int\sin\left(x\right)e^{2\cos\left(x\right)}dx$
$\cos\left(t\right)+i\cdot\sin\left(t\right)+\cos\left(2t\right)+i\cdot\sin\left(2t\right)$
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