$\left(3b^{-4}c^{-2}\right)^6c^3$
$\lim_{x\to0}\left(\frac{x}{2x^2+2x+1}\right)$
$\lim_{x\to0}\left(\frac{\tan\left(6x\right)}{\tan\left(7x\right)}\right)$
$\frac{\tan\left(x\right)+1}{\sec\left(x\right)+\cot\left(x\right)}$
$x+5x^2-10x^4+15x^6-20x^3$
$2x\left(9x^3+6w^2-3x\right)$
$8+\frac{8}{4}$
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