\frac { 3 + 40 - 4 \cos ^ { 2 } \theta } { \cos \theta } d \theta =
Evaluate
\frac{d\theta \left(-4\left(\cos(\theta )\right)^{2}+43\right)}{\cos(\theta )}
Differentiate w.r.t. θ
\frac{d\left(4\theta \sin(\theta )\left(\cos(\theta )\right)^{2}-4\left(\cos(\theta )\right)^{3}+43\theta \sin(\theta )+43\cos(\theta )\right)}{\left(\cos(\theta )\right)^{2}}
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