Use Sum and Difference Formulas for Cosines and Sines
- $\cos \frac { 7 \pi } { 12 } \sin \frac { 5 \pi } { 12 } - \cos \frac { 5 \pi } { 12 } \sin \frac { 7 \pi } { 12 }$

question 59

Multiple Choice

Use Sum and Difference Formulas for Cosines and Sines
- $\cos \frac { 7 \pi } { 12 } \sin \frac { 5 \pi } { 12 } - \cos \frac { 5 \pi } { 12 } \sin \frac { 7 \pi } { 12 }$

• A) \(\frac { 1 } { 2 }\)
• B) \(\frac { \sqrt { 3 } } { 2 }\)
• C) \(\frac { 1 } { 4 }\)
• D) 1

---

Definitions:

It's

abbreviation for "it is" or "it has."

Been

The past participle of "be," used in perfect tenses to indicate an action that occurred at an unspecified time before now.

You're

A contraction of "you are," often used in informal writing or speech.

Ten-speed

A bicycle equipped with ten gears for different speeds and terrains.