$\frac{\left(k^2-x^2\right)}{\left(x^4-k^4\right)}$
$6+4m-17g+6m+3g$
$\tan\left(x\right)\tan\left(x\right)+\csc\left(x\right)$
$36m^{12}n^{14}-64x^4y^2$
$\:23\:-\:\left(-4\right)\:+\:\left(-9\right)\:-\:17$
$4\left(2x+3\right)-7x$
$\sqrt{63}$
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