A community for students.
Here's the question you clicked on:
 0 viewing
hannahg
 3 years ago
Find all solutions in the interval [0, 2π).
sin2x + sin x = 0
hannahg
 3 years ago
Find all solutions in the interval [0, 2π). sin2x + sin x = 0

This Question is Closed

.Sam.
 3 years ago
Best ResponseYou've already chosen the best response.2Do you know what's the identity for sin2x?

hannahg
 3 years ago
Best ResponseYou've already chosen the best response.02sinx+cosx+sinx=0 right? what do i do next?

.Sam.
 3 years ago
Best ResponseYou've already chosen the best response.2no, it should be from sin2x + sin x = 0 to 2sinxcosx + sin x =0 right?

.Sam.
 3 years ago
Best ResponseYou've already chosen the best response.2you should try factoring now

hannahg
 3 years ago
Best ResponseYou've already chosen the best response.0sinx(2cosx+1)=0 is this right? what do i do next? o.O

.Sam.
 3 years ago
Best ResponseYou've already chosen the best response.2yes, now you can let sinx=0 and 2cosx+1=0 then find the x values

AravindG
 3 years ago
Best ResponseYou've already chosen the best response.1equate that to 0 and find x values

hannahg
 3 years ago
Best ResponseYou've already chosen the best response.0so i got cosx=1/2 how do i find the value of x?

.Sam.
 3 years ago
Best ResponseYou've already chosen the best response.2well you can do this cosx=1/2 x=cos^{1} (1/2)

hannahg
 3 years ago
Best ResponseYou've already chosen the best response.0so what are all possible values of x? 0 and......what else O.o

AravindG
 3 years ago
Best ResponseYou've already chosen the best response.1@hannahg :) instead of o.O

.Sam.
 3 years ago
Best ResponseYou've already chosen the best response.2you calculate cos^(1) 1/2 first without minus on half you'll get 60 degrees

.Sam.
 3 years ago
Best ResponseYou've already chosen the best response.2then use this chart for cosine dw:1358873950517:dw we are looking at the minus side since we got minus half. then 18060=120 degrees 180+60=240 degrees

AravindG
 3 years ago
Best ResponseYou've already chosen the best response.1@hannahg thats better :)

hannahg
 3 years ago
Best ResponseYou've already chosen the best response.0yes. so all the possible solutions will be pi, pi/3, 2pi/3?

.Sam.
 3 years ago
Best ResponseYou've already chosen the best response.2you still have sinx=0 to do

.Sam.
 3 years ago
Best ResponseYou've already chosen the best response.2yes but dont forget about 180

.Sam.
 3 years ago
Best ResponseYou've already chosen the best response.2since theta is 0, then you get 180

hannahg
 3 years ago
Best ResponseYou've already chosen the best response.0@.Sam. so what are all solutions in the interval??
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.