$\cot e+\frac{\sin e}{1+\cos e}=\csc e$
$40+5y^2+4y^2-9y^2$
$\left(x^2+2\right)^4\left(x^3+2\right)^3$
$\frac{-10n^2}{21}\cdot\frac{-6n^4}{25}$
$\left(\cos x-1\right)\left(\sin x+1\right)=0$
$\sec\left(y\right)+\cos\left(y\right)$
$\frac{1}{2}^0$
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