$4a-11a$
$2\left(1-\cos^2\left(a\right)\right)+\cos^2a$
$-25x-50x$
$\frac{dy}{dx}=4xy$
$\int\frac{x^3+2x-8}{x-1}dx$
$x^2+2xy^2-y^2=9$
$\int\frac{1-x^2}{\left(x^2+1\right)}dx$
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