$x+13=-37$
$\frac{cos^2\theta-2\:sin^2\theta}{1-3\:sin^2\theta}$
$-1-20x-2x\:$
$\left(-12-32-45-69-87\right)\:$
$\int\frac{7x+7}{x^2+3x-10}dx$
$-2\pi\frac{\pi}{2}1+2n$
$\:k^2-3k-180$
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