$x\cos\left(y\right)\frac{dy}{dx}=2x-seny$
$7\tan^2b-6\sec^2b+8$
$\int x\cdot e^{-4x}dx$
$x^2-x+18$
$\int\frac{x^4}{x^2+289}dx$
$\int\left(\frac{3+x}{x^2-1}\right)dx$
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