$\left(x-3\right)^2=4\left(x-5\right)$
$cos\left(-15\right)cos\left(75\right)+sin\left(-15\right)sin\left(75\right)$
$-10+-14+2$
$2sen2x\cdot cosx-sen3x$
$\left(\:x\:-\:8\:\right)\:x\:\left(\:x\:-\:3\:\right)\:$
$\left(x-2\right)\left(5x-3x^2+11\right)$
$y'+\cot\left(x\right)y=2x\csc\left(x\right)$
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