8. If $x _ { 1 } = \frac { \pi } { 4 } , x _ { 2 } = \frac { 3 \pi } { 4 }$ are two adjacent extreme points of the function $f ( x ) = \sin \omega x ( \omega > 0 )$, then $\omega =$ A. 2 B. $\frac { 3 } { 2 }$ C. 1 D. $\frac { 1 } { 2 }$
The figure on the right is a flowchart for computing $\frac { 1 } { 2 + \frac { 1 } { 2 + \frac { 1 } { 2 } } }$. The blank box in the figure should contain
8. If $x _ { 1 } = \frac { \pi } { 4 } , x _ { 2 } = \frac { 3 \pi } { 4 }$ are two adjacent extreme points of the function $f ( x ) = \sin \omega x ( \omega > 0 )$, then $\omega =$\\
A. 2\\
B. $\frac { 3 } { 2 }$\\
C. 1\\
D. $\frac { 1 } { 2 }$