Use a Calculator to Decide Whether the Statement Is True $$\cos \left( 2 \cdot 90 ^ { \circ } \right) = \cos ^ { 2 } 90 ^ { \circ } - \sin ^ { 2 } 90 ^ { \circ }$$

Multiple Choice

Use a calculator to decide whether the statement is true or false.
- $$\cos \left( 2 \cdot 90 ^ { \circ } \right) = \cos ^ { 2 } 90 ^ { \circ } - \sin ^ { 2 } 90 ^ { \circ }$$

A) True
B) False