$-49+\left(-76\right)-27$
$\int\frac{4x}{\left(1+x^2\right)\left(x-1\right)^2}dx$
$\csc\left(20\right)\cos\left(-70\right)$
$\int\cos x\sqrt{\sin x+1}dx$
$\left(3x^2+5\right)=3x^2+5$
$\frac{x+3}{x-1}=x-3$
$-3000-2570$
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