$\frac{tan\left(t\right)+cot\left(t\right)}{csc\left(-t\right)}$
$4x-2y=40$
$9+b+2-9$
$\frac{d^2}{dx^2}\left(5x^5+3x^4\right)$
$\frac{d}{dx}\:\frac{2z}{y}-\frac{3y}{z}=8$
$9x\left(5\right)+13x\left(5\right)-23x\left(5\right)+49$
$\int_0^3\left(x\cdot e^{-x}\right)dx$
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