$\sin\left(a+b\right)\cos a+\cos\left(a+b\right)\sin a$
$\lim_{x\to0}\left(\frac{cos\left(x\right)}{cot\:2x}\right)$
$5b+3b-19$
$3\left(2^2\right)-2\left(3\right)+4$
$\left(2a^{2}b+3a^{2}b\right)+\left(3a^{2}b+5a^{2}b\right)$
$\:\int\:\:e^{\sqrt{x+1}}dx$
$\frac{25x^7y^8}{5x^5y}$
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