$1+a+a^2+a^3+a^4+a^5$
$3x^4+2x^3+11x^2+8x-4$
$5x+41=10x+66$
$\sec\left(x\right)\left(1-\cos\left(x\right)\right)+\sec\left(x\right)\left(1+\cos\left(x\right)\right)$
$\frac{3xy}{xy}$
$\frac{4}{sec\left(x\right)+tan\left(x\right)}$
$12x^3,\:8x^2y^2,\:3xy^2$
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