$2b-b-7b$
$-10\cos\:\left(x\right)^2-3\sin\:\left(x\right)+9$
$\frac{27x^{-9}}{18x^{-3}}$
$\left(x+1\right)\left(x+3\right)-\left(x-2\right)^2$
$\lim_{x\to\infty}\left(10xe^{-3x}\right)$
$\csc s=1.5576$
$\left(4r^6z^5\right)^2$
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