$\int\left(\frac{1}{9x^2-144}\right)dx$
$\int-7cos\left(\frac{1}{7}x\right)dx$
$\sin\left(a-b\right)+\sin\left(a\right)-sin\left(b\right)$
$\frac{3}{\sqrt{x-4}}$
$25a^{2}-121b^{6}$
$\int\frac{x-5}{x^2-9}dx$
$3 . ( x ^ { 2 } + 6 ) ( x ^ { 2 } - 6 )$
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