$\left(a^{x+1}-2b^{x+1}\right)\left(a^{x+1}+2b^{x+1}\right)$
$\lim_{x\to0}\left(\frac{\left(1-\cos\left(x\right)\cdot\sin\left(x\right)\right)}{x^2}\right)$
$\int xe^{-7x^2}dx$
$\int2.5e^xdx$
$\log_x\left(3x-2\right)=2$
$a^2+5a-84$
$5pq^3\left(p^5+2p^3q-5q^4\right)$
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