$-4n-6n-8+9$
$\lim_{x\to2}\left(3x^2-5x-2\right)$
$4sin\left(\frac{\pi\:}{8}-b\right)cos\left(\frac{\pi\:}{8}+b\right)=\sqrt{2}+2sin2b$
$\left(\frac{7}{9}a^5b+\frac{2}{3}\right)\left(\frac{7}{9}a^5b-\frac{2}{3}\right)$
$\int\left(9csc^2\left(t\right)-2e^t\right)dx$
$-4\tan\left(x\right)-4=0$
$12-2y$
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