Use a Calculator to Evaluate the Given Trigonometric Function $$\tan \left( 45 ^ { \circ } \right)$$

Use a calculator to evaluate the given trigonometric function. Round the answer to three decimal places as needed. $$\tan \left( 45 ^ { \circ } \right)$$ .

A) $1.732$
B) $3.732$
C) $\text { infinity }$
D) $0.577$
E) $1.000$