$\lim_{x\to+\infty}\left(3x+\sqrt{9x^2-2x}-1\right)$
$\left(x^5+x^2\right)^2$
$\frac{6\sin\left(x\right)+3\tan\left(x\right)}{\tan\left(x\right)}$
$\int\left(3t+t^4\right)cos2tdx$
$k^2-13+40$
$\left(0+8\right)^n$
$3x+6>0$
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