$\lim_{x\to\infty}\left(\frac{e^x-x-1}{cos\left(2x\right)}\right)-1$
$+\frac{\frac{\cos a}{\sin a}}{\frac{\cos a-\sin a}{\cos a}}$
$19g+25-19g$
$\int\:\:x^3\sqrt{x^4-1}dx$
$\sin\left(-t\right)\cos\left(-t\right)\csc\left(t\right)$
$8x-5y=-11$
$2z-z$
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