$\cos\frac{\pi}{2}-x$
$\int39x^2\sin\left(2x\right)dx$
$-9+4-9+8-20+3\left(9\right)-15+30+4\left(3\right)-40$
$-x-4x+17-12-x+-1-3x+10x-6-1$
$-34+58-63-28-79+17$
$\int_{-1.686}^{1.186}\left(-\frac{x}{2}\right)dx$
$4.6-\frac{1}{4.6}$
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