$-2x^2-7x+15=0$
$\int_{f-1}^2fdx$
$\sec^20\cos^20=1$
$\left(\frac{2}{3}a-3b\right)^2$
$laplace\:\left(e^t-e^{-t}\right)^2$
$3x^2-10x$
$\frac{d}{dx}-2x^4-6$
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