Find the indicated function value. If it is undefined, say so. See Example 4. cos 1800°

Find the indicated function value. If it is undefined, say so. See Example 4. sin 90°

Find the indicated function value. If it is undefined, say so. See Example 4. sec 180°

Find the indicated function value. If it is undefined, say so. See Example 4. sin(―270°)

Find the indicated function value. If it is undefined, say so. See Example 4. tan 450°

Find the indicated function value. If it is undefined, say so. See Example 4. sec 1800°

Use trigonometric function values of quadrantal angles to evaluate each expression. 3 sec 180° ― 5 tan 360°

Use trigonometric function values of quadrantal angles to evaluate each expression. tan 360° + 4 sin 180° + 5(cos 180°)²

Use trigonometric function values of quadrantal angles to evaluate each expression. (sin 180°)² + (cos 180°)²