Cosine Square Sum
1. Stating the problem: We need to find the value of $\cos^2 40^\circ + 1$.
2. Recall the Pythagorean identity:
$$\sin^2 \theta + \cos^2 \theta = 1$$
which implies
$$\cos^2 \theta = 1 - \sin^2 \theta$$
3. Substitute $\theta = 40^\circ$ into the expression:
$$\cos^2 40^\circ + 1 = (1 - \sin^2 40^\circ) + 1 = 2 - \sin^2 40^\circ$$
4. Therefore, the expression simplifies to:
$$2 - \sin^2 40^\circ$$
5. This matches the second option given.
Final answer: $2 - \sin^2 40^\circ$