$xe^x-e^x+\frac{1}{2}y^2=c$
$\frac{1+2\sin\left(x\right)}{\sin\left(x\right)}-\sin\left(x\right)$
$\int30csc^2\left(x\right)dx$
$\lim_{x\to0}\left(\frac{7x+sinx}{2x+cosx}\right)$
$\frac{2\sin\left(x\right)}{\sin\left(x\right)\cot\left(x\right)+\cos\left(x\right)}$
$x-7=2x-1$
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