$2\left(7p\right)$
$sec\left(-\frac{\pi}{18}\right)cos\frac{37\pi}{18}$
$\lim_{x\to0}\left(\frac{\sin\left(x\right)}{x^2-1}\right)$
$\int\left(3x+2\right)sen\left(3x\right)dx$
$\frac{2^{2x}}{5^{x-1}}$
$\left(7xy^3-2y\right)\left(7a^3+2abc\right)$
$x+3.2=5.3$
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