Find the exact circular function value.
-$\sin \frac { - 5 \pi } { 4 }$
A) $- \frac { \sqrt { 2 } } { 2 }$
B) $\frac { \sqrt { 2 } } { 2 }$
C) $\frac { 1 } { 2 }$
D) $- \frac { 1 } { 2 }$

Question

Quizplus · Accepted Answer

The reference angle for $\frac { - 5 \pi } { 4 }$ is $\frac { \pi } { 4 }$, which is in the first quadrant. Since the sine function is positive in the first quadrant, the answer is $\frac { \sqrt { 2 } } { 2 }$.

Find the Exact Circular Function Value sin⁡−5π4\sin \frac { - 5 \pi } { 4 }sin4−5π​

Find the Exact Circular Function Value $\sin \frac { - 5 \pi } { 4 }$