$\sec\left(a\right)=\sin\left(a\right)\left(\tan\left(a\right)+\cot\left(a\right)\right)$
$\left(5xy+6\right)\left(5xy-23\right)$
$13^2-17^2$
$\frac{w}{-13}+5=2$
$\int\:tan^53xdx$
$f\left(x\right)=\left(x^3-8\right)^8$
$\lim_{x\to0}\left(\frac{2cos\left(2x\right)sin\left(2x\right)}{x^2}\right)$
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