$\left(2.04\right)\cdot\left(-30.6\right)$
$x\frac{dy}{dx}+4y=x^3+x$
$7.5\cdot9$
$\sqrt[5]{\sqrt[4]{27x^3}}$
$\frac{\left(1+\theta\right)}{\theta}=\theta$
$\int\frac{1}{x^2\left(x+4\right)}dx$
$4\cos\left(a\right)+4=2\cos\left(a\right)+4$
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