# Calc2.21

Find the derivative of $f(x)\,$ with respect to $x\,$: $f(x)=\tan^2x+8(x^2+4x+3)^9+\sec^3x\,$
$f'(x)=2(\tan x)(\sec^2x)+72(x^2+4x+3)^8(2x+4)+3(\sec^2x)(\sec x\tan x)\,$