$\frac{4x^6-6x^4}{2x^3}$
$\left(-15\right)\left(-20\right)-\left(-6\right)\left(-12\right)$
$\cot\left(x\right)^2\sec\left(x\right)^2\csc\left(x\right)$
$\left(x^2-6x-7\right)-\left(x^2+4x-6\right)$
$\left(3x^2\:+\:2x\right)^2$
$3,25b+2h$
$\left(x-28\right)\cdot\left(x-11\right)$
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