$y=\left(1-senx\right)^{-\frac{1}{2}}$
$-19-\left(-6\right)$
$-x^2-6x-9$
$\int-\left(x+1\right)dx$
$\frac{d^2}{dx^2}\left(e^{x+y}\right)$
$3\:cot^2\:x\:-\:4\:cot\:x\:+1$
$3\cdot21\cdot10^{-3}$
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