Give the exact value.
-$\cos \frac { \pi } { 4 }$
A) $\frac { 1 } { 2 }$
B) $\frac { \sqrt { 2 } } { 2 }$
C) $\sqrt { 2 }$
D) $\frac { \sqrt { 3 } } { 2 }$

Name: Give the exact value. -$\cos \frac { \pi } { 4 }$ A) $\frac { 1 } { 2 }$ B) $\frac { \sqrt { 2 } } { 2 }$ C) $\sqrt { 2 }$ D) $\frac { \sqrt { 3 } } { 2 }$
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Question

Quizplus · Accepted Answer

The cosine of $\frac{\pi}{4}$ radians (or 45 degrees) is $\frac{\sqrt{2}}{2}$, which is a well-known value from the unit circle.

Give the Exact Value cos⁡π4\cos \frac { \pi } { 4 }cos4π​

Give the Exact Value $\cos \frac { \pi } { 4 }$