Find the Exact Value of the Expression If θ = $\mathrm { g } ( \theta ) = \cos \theta \quad$

Multiple Choice

Find the exact value of the expression if θ = 45°. Do not use a calculator.
- $\mathrm { g } ( \theta ) = \cos \theta \quad$ Find $12 \mathrm {~g} ( \theta )$ .

A) $12 \sqrt { 2 }$
B) $- 6 \sqrt { 2 }$
C) $6 \sqrt { 2 }$
D) $- 12 \sqrt { 2 }$