$\lim_{t\to\pi}\left(\frac{csct}{csc3t}\right)$
$16x-4xy-6y^2$
$2,01\cdot1,04$
$64.2\:+\:0.04\:+\:18\:+\:17.376\:+\:0.4219$
$\int\left(\sec\left(x\right)+\cot\left(x\right)\right)^2dx$
$\left(11+21\right)-20-\left(35-12\right)+20-\left(-55\right)$
$2sinx-cosxsin\left(2x\right)$
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