$1\:=\:sec^2x\left(\:1\:-\:sin^2x\right)$
$\frac{x^6}{x^{-1}\cdot x^7}$
$6x^4-24x^3-18x^2+108x$
$\frac{dy}{dx}=xcos\left(x\right)+xy^2cos\left(x\right)$
$2a+b;\:a=1;\:b=2$
$\left(x^2+a^2\right)\left(x^4+a^4\right)$
$8ab+13xy-12ab+4xy-3$
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