$2i-1\left(i^2+i\right)$
$-12-13+4-15$
$2\sin\left(x\right)^4+2\sin\left(x\right)^2\cos\left(x\right)^2=1-\cos\left(2x\right)$
$9\left(4x^2-3\right)$
$u^2-9u^2$
$\lim_{x\to\infty}\left(\frac{x+1}{x^3+x}\right)$
$2\int\left(\sqrt{\sin\left(x\right)+1}\right)dx$
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