$47\left(-20\right)\left(-5\right)$
$\csc\left(x\right)\left(\cos^3\left(x\right)\tan\left(x\right)-\sin\left(x\right)\right)$
$x^2-6+36$
$\frac{dy}{dx}=\frac{1+x}{y.x^2}$
$3b+3b+3b$
$8\left(y\right)^{''}+4\left(y\right)^'+5y=0$
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