$4\left(-3\right)+2\left(-1\right)\left(-3\right)-2\left(5\right)$
$\csc x=\frac{5}{4}$
$\left(2x^3y^2-4yz^3\right)^3$
$3\left(10-2^2\right)$
$\frac{u^3v^{-6}w^{-11}}{x^6y^{10}z^{-3}}$
$\left(x^2+1\right)\left(x^3-x\right)\left(3x^4+2x-1\right)$
$-\frac{1}{2}\left(2.49\right)$
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