$k^3+4k^2-5k$
$\frac{1}{1\:-\:sin\left(x\right)}+\frac{1}{1\:+\:sin\left(x\right)}=2\:sec\left(x\right)$
$-\left(-150\right)+\left(-5\right)+\left(-190\right)-\left(134\right)$
$6\left(-6\right)^2-3\left(-2\right)^2$
$\lim_{x\to1}\left(\frac{9sin\left(9\pi\right)}{cos\left(\pi x\right)+x}\right)$
$2x+3y^2;\:x=3;\:y=1$
$\left(-3x^{2y^{-3}}\right)$
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