A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
Us the Sum Formula to:
a. Find the exact value of cos 105 degrees
b. Find the exact value of sin 5pi/12
anonymous
 one year ago
Us the Sum Formula to: a. Find the exact value of cos 105 degrees b. Find the exact value of sin 5pi/12

This Question is Closed

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.2Hint for part a : 105 = 60 + 45

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@rvc wait is that it?

freckles
 one year ago
Best ResponseYou've already chosen the best response.0the question already provides a hint use the sum formula and we know to use the sum formula for cosine since we are asked to find cos(105) and @ganeshie8 gave you the hint that 105 is 60+45 and @rvc is just trying to get you to look at your identitys sheet and copy over the identity mentioned for cos(A+B) and replace the A with 60 and the B with 45 and evaluate using unit circle

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0how did he get 60 and 45 though? @freckles

myininaya
 one year ago
Best ResponseYou've already chosen the best response.260 and 45 when added gives you 105

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yeah but why those in particular? 100 + 5 gives you 105 too?

myininaya
 one year ago
Best ResponseYou've already chosen the best response.2is 100 and 5 on the unit circle?

rvc
 one year ago
Best ResponseYou've already chosen the best response.1well we have those values already and can easily plug in

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.2dw:1433395044353:dw
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.