$\frac{cosx+cotx}{cosx-cotx}$
$\cos\left(2x\right)=-0,5$
$\sqrt{4^2}+x^2$
$9-10a+1$
$\int\frac{2x^3+5x}{\left(x^2+3\right)\left(x^2+2\right)}\:dx$
$\int\cot^2\frac{5}{4}xdx$
$12-4b+9b$
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