$\left(6a^2\right)+\left(9b^2\right)^2$
$\lim_{x\to0}\left(\frac{e^{4x}-1}{3x^2+2x}\right)$
$3 x ^ { 2 } - 12$
$2\csc^2x+cotx=5$
$\lim_{x\to-\infty}\left(\frac{3x^2}{2x-3}\right)$
$\int\frac{y^3}{\left(1-y^2\right)^5}dy$
$-x^2+5x-3$
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