$\lim_{x\to7}\left(\frac{x^2+8x-105}{x-7}\right)$
$\left(x^2y+4xy^2\right)^2$
$2\cdot5^2-2^3$
$\left(j+m\right)^3$
$sin\left(63t\right)cos\left(126t\right)\:$
$\int9tan^2\left(x\right)sec^2\left(x\right)dx$
$\cos\left(2\pi x\right)^2$
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