$2b\left(2a-3\right)\left(2a+3\right)$
$\left(2x+1\right)\sqrt{1+4x^2}$
$\lim_{x\to-\pi}\left(\sec^2\left(x\right)-1\right)$
$\left(-0.3x+.4\right)\left(0.3x-1.4\right)$
$-3x-2^3$
$\left(\frac{9^6}{9}\right)^2$
$\int_0^4\left(1-e^{-2}\right)dx$
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