$\left(a+11\right)\left(a+4\right)$
$\left(4x-7y\right)\left(4x-7x\right)$
$\int\frac{x}{\left(x+1\right)^2\left(x^2+1\right)}dx$
$\left(6x^3y\right)\left(-5x^7y^6\right)$
$\int xcos\frac{x}{2}dx$
$sin\left(cos^{-1}u-sin^{-1}v\right)$
$\log_x\left(15\right)$
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