$3^8\cdot\:\frac{1}{3^1}$
$\frac{\left(sec\:a\:-\:tana\right)}{seca\:+\:tan\:a}$
$cotx\left(sec^4\right)$
$\frac{dy}{dx}=e^{3x}.e^{2y}$
$2y''\:+\:6y'-176y\:=\:0$
$3x+4x+5$
$\int\frac{t^3+1}{t+1}dt$
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