$\frac{2\sec\left(x\right)}{\csc\left(x\right)}$
$2ab-30$
$\int\frac{x-2}{x^2-1}dx$
$\int ln11xdx$
$\frac{dx}{dy}=10-\frac{2x}{100-y}$
$3-2x\ge7$
$\frac{\tan\left(x\right)}{\sin\left(x\right)}+\csc\left(x\right)=\sec\left(x\right)\cdot\csc^2\left(x\right)$
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