Simplify cos2 Θ (1 + tan2 Θ).

So first of all you need to know the trigonometric property of 1 + tan2 (theta) = sec^2 (theta) so we get a cos^2 (theta) (sec^2 (theta)) and based on that properties and simplifications, I came up with and answer of Cos^2 (theta) (1/cos^2 (theta)) = 1. I hope you are satisfied with my answer and feel free to ask for more