Get the answers you need at Westonci.ca, where our expert community is always ready to help with accurate information. Join our platform to connect with experts ready to provide precise answers to your questions in various areas. Get immediate and reliable solutions to your questions from a community of experienced professionals on our platform.
Sagot :
Answer:
b
Step-by-step explanation:
use cos(r + s ) = cosrcoss - sinrsins to expand.
cos pi/3 cosx - sin pi/3 sinx + cos pi/3 cosx + sin pi/3 sinx
the two in bold cancel out.
cospi/3 cosx + cospi/3 cosx
pi = 180° in trigonometry.
cos 180/3 cosx + cos 180/3 cosx
1/2 cosx + 1/2 cosx
= cos x
- cos(A+B)+cos(A-B)=2cosAcosB
Hence
- cos(π/3+x)+cos(π/3-x)
- 2cosπ/3(cosx)
- 2(1/2)(cosx)
- cosx
Your visit means a lot to us. Don't hesitate to return for more reliable answers to any questions you may have. Thank you for visiting. Our goal is to provide the most accurate answers for all your informational needs. Come back soon. Stay curious and keep coming back to Westonci.ca for answers to all your burning questions.