Find ddθ[tan2(θ)]\frac{d}{d\theta}[\tan^2(\theta)]dθd[tan2(θ)].
2tan(θ)2\tan(\theta)2tan(θ)
2sec2(θ)2\sec^2(\theta)2sec2(θ)
2tan(θ)sec2(θ)2\tan(\theta)\sec^2(\theta)2tan(θ)sec2(θ)
sec4(θ)\sec^4(\theta)sec4(θ)