$\int\frac{5x+2}{x^2+4}dx$
$1-\cos\left(a\right)+\sin^2a$
$\int x\left(ln\left(3+x\right)\right)dx$
$x^4+2x^3-23x^2-60x$
$\cos^2\left(1\right)-\sin^2\left(1\right)$
$x^2-8x-4$
$-527-748$
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