Question

Find the exact value by using a half-angle identity.
-$$\sin \frac { \pi } { 11 } + \sin \frac { \pi } { 4 }$$

Accepted Answer

A)  $2 \cos \frac { 15 \pi } { 88 } \cos \frac { 7 \pi } { 88 }$ 
B)  $2 \cos \frac { 15 \pi } { 88 } \sin \frac { 7 \pi } { 88 }$ 
C)  $2 \sin \frac { 15 \pi } { 88 } \sin \frac { 7 \pi } { 88 }$ 
D)  $2 \sin \frac { 15 \pi } { 88 } \cos \frac { 7 \pi } { 88 }$ 
A)  $2 \cos \frac { 15 \pi } { 88 } \cos \frac { 7 \pi } { 88 }$ 
B)  $2 \cos \frac { 15 \pi } { 88 } \sin \frac { 7 \pi } { 88 }$ 
C)  $2 \sin \frac { 15 \pi } { 88 } \sin \frac { 7 \pi } { 88 }$ 
D)  $2 \sin \frac { 15 \pi } { 88 } \cos \frac { 7 \pi } { 88 }$

Find the exact value by using a half-angle identity. - $\sin \frac { \pi } { 11 } + \sin \frac { \pi } { 4 }$

Trigonometric Functions

Acute Angles and Right Triangles

Radian Measure and the Unit Circle

Graphs of the Circular Functions

Inverse Circular Functions and Trigonometric Equations

Applications of Trigonometry and Vectors

Complex Numbers, Polar Equations, and Parametric Equations

Filters

Exam 5: Trigonometric Identities

Find the exact value by using a half-angle identity. - sin⁡π11+sin⁡π4\sin \frac { \pi } { 11 } + \sin \frac { \pi } { 4 }sin11π​+sin4π​