Find the exact value of the expression if θ = 30°. Do not use a calculator.
-$\mathrm { f } ( \theta ) = \cos \theta \quad$ Find $[ \mathrm { f } ( \theta ) ] ^ { 2 }$.
A) $\frac { \sqrt { 3 } } { 2 }$
B) $\sqrt { 3 }$
C) $\frac { 3 } { 4 }$
D) $\frac { 1 } { 4 }$

Question

Quizplus · Accepted Answer

The value of $\cos(30°)$ is $\frac{\sqrt{3}}{2}$. Squaring this value gives $\left(\frac{\sqrt{3}}{2}\right)^2 = \frac{3}{4}$.

Find the Exact Value of the Expression If θ = f(θ)=cos⁡θ\mathrm { f } ( \theta ) = \cos \theta \quadf(θ)=cosθ

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