Find the exact value of $$ \cos \left(-45^{\circ}\right) $$

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Find the value of $$ \cos(-45^{\circ}) $$.
Calculate the value by following steps:
- step0: Calculate:
  $$\cos\left(-45^{\circ}\right)$$
- step1: Rewrite the expression:
  $$\cos\left(45^{\circ}\right)$$
- step2: Calculate the trigonometric value:
  $$\frac{\sqrt{2}}{2}$$
The exact value of $$ \cos \left(-45^{\circ}\right) $$ is $$ \frac{\sqrt{2}}{2} $$.
$$ \cos(-45^{\circ}) = \frac{\sqrt{2}}{2} $$

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