$a-1-2x+a-1$
$\left(2xy-y^2\right)dx+\left(x^2-2xy\right)dy=0$
$\frac{\tan^2\left(b\right)-\sin^2\left(b\right)}{\tan^2\left(b\right)}=\sin^2\left(b\right)$
$387+295+321$
$\frac{csc\left(x\right)}{csc\left(x\right)-1}+\frac{csc\left(x\right)}{csc\left(x\right)+1}=2sec^2\left(x\right)$
$\int\frac{a}{x-2}dx$
$\frac{x}{5x-6}-\frac{x+3}{6x}$
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