$\int2\sin\left(2y-1\right)dx$
$\frac{\sin\left(a+b\right)}{\cos\left(a\right)\sin\left(b\right)}=\tan\left(a\right)\cot\left(b\right)+1$
$\left(78\right)-\left(-28\right)$
$\int x^8\ln\left(9x\right)dx$
$-6y+y^2-4y^2-4y$
$\left(a-\sqrt{x}\right)\left(x+\sqrt{a}\right)$
$\lim_{x\to\infty}\left(\frac{e^x+1}{e^{2x}-1}\right)$
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