A community for students.
Here's the question you clicked on:
 0 viewing
sara1234
 3 years ago
Helpp
sara1234
 3 years ago
Helpp

This Question is Closed

sara1234
 3 years ago
Best ResponseYou've already chosen the best response.0@jim_thompson5910 @Nameless

jim_thompson5910
 3 years ago
Best ResponseYou've already chosen the best response.1sin(3x) = sin(2x + x) sin(3x) = sin(2x)cos(x) + cos(2x)sin(x) sin(3x) = sin(x+x)cos(x) + cos(x+x)sin(x) sin(3x) = [sin(x)cos(x) + cos(x)sin(x)]cos(x) + [cos(x)cos(x)  sin(x)sin(x)]sin(x) sin(3x) = [2cos(x)sin(x)]cos(x) + [cos^2(x)  sin^2(x)]sin(x) sin(3x) = 2cos^2(x)sin(x) + cos^2(x)sin(x)  sin^3(x) Do the same to find cos(3x)

jim_thompson5910
 3 years ago
Best ResponseYou've already chosen the best response.1I'm using the identities sin(x+y) = sin(x)cos(y) + cos(x)sin(y) cos(x+y) = cos(x)cos(y)  sin(x)sin(y)

jim_thompson5910
 3 years ago
Best ResponseYou've already chosen the best response.1sry i should have gone further sin(3x) = 3cos^2(x)sin(x)  sin^3(x)

sara1234
 3 years ago
Best ResponseYou've already chosen the best response.0im confused can you tell me what the answer is so i can check if i got it right?

jim_thompson5910
 3 years ago
Best ResponseYou've already chosen the best response.1hold on one sec

jim_thompson5910
 3 years ago
Best ResponseYou've already chosen the best response.1checking the answer, but the second one doesn't seem right, but one sec

jim_thompson5910
 3 years ago
Best ResponseYou've already chosen the best response.1well using a graphing calculator, I was able to eliminate choices A through C so that leaves D
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.