$\int_{-1.4}^{1.4}\left(\left(\frac{1}{2}x^2\right)-\left(x^2-1\right)\right)dx$
$2x-3x$
$\left(3x^3-a^2\right)^2$
$\int\frac{e^{sinx}}{secx}dx$
$\lim_{x\to\frac{2}{3}}\left(\frac{9x^2-4}{3x-4}\right)$
$2^{11}\cdot2^{-7}$
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