How to evaluate the indefinite integral 1/(Cos²Θ)dΘ | Integrate 1/(Cos^2(x))dx | calculus

In this video I explain how to evaluate the indefinite integral 1/(Cos²Θ)dΘ,
∫1/(Cos²Θ)dΘ. I demonstrate how to use a trig identity to replace 1/(Cos²Θ) and create a function that is more easily integrated.