$\int\left(\frac{3cosx+8sinx}{cos^3x}\right)dx$
$x^3-x^9$
$\left(6m-4n\right)^2$
$2x+4y-5=0$
$7\left(2+n\right)=28$
$15x^8y^7-4y^8x^{13}$
$3x^2\cdot2^4+x^2-4x-1$
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