$\frac{3x-20}{\left(x+5\right)\left(x-2\right)}$
$3sin2t+3sin\left(2t-\frac{\pi\:}{4}\right)$
$12a-5b+\left(3a-2b\right)-\left(-8b-10\right)$
$x^3-4x^2y+6xy^2.ax^3y$
$\lim_{x\to0}\left(\frac{e^x-1}{sinx^{13}}\right)$
$3\tan=5\sin$
$e^{2.9675}$
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