Find the exact value of the expression.
-cos 45°
A) $\frac { 1 } { 2 }$
B) $\sqrt { 2 }$
C) $\frac { \sqrt { 3 } } { 2 }$
D) $\frac { \sqrt { 2 } } { 2 }$

Name: Find the exact value of the expression. -cos 45° A) $\frac { 1 } { 2 }$ B) $\sqrt { 2 }$ C) $\frac { \sqrt { 3 } } { 2 }$ D) $\frac { \sqrt { 2 } } { 2 }$
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Question

Find the exact value of the expression.
-cos 45° 
A) $\frac { 1 } { 2 }$
B) $\sqrt { 2 }$
C) $\frac { \sqrt { 3 } } { 2 }$
D) $\frac { \sqrt { 2 } } { 2 }$

Quizplus · Accepted Answer

The cosine of 45 degrees is $\frac{\sqrt{2}}{2}$, which is a well-known value from the unit circle and trigonometric identities.

Find the Exact Value of the Expression 12\frac { 1 } { 2 }21​

Find the Exact Value of the Expression $\frac { 1 } { 2 }$