Answer
$y'=(6θ+3secθtanθ)(θ^2+secθ+1)^2$
Work Step by Step
Take the derivative of the equation, and apply Chain Rule to the inner terms:
$y'=3(θ^2+secθ+1)^2\times(2θ+secθtanθ)$
$=(6θ+3secθtanθ)(θ^2+secθ+1)^2$
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