Ask
your own question, for FREE!
Mathematics
22 Online
Find all solutions to the equation in the interval [0, 2π) 2 cos x + sin 2x = 0
Still Need Help?
Join the QuestionCove community and study together with friends!
hi kcb,, the trig identity is: sin 2x=2sin x cos x
therefore, 2cos x +2sin x cos x+0
im sorry,its equal to zero 2cos x +2sin x cos x=0
now take out the cos x,... cos x (2+2sin x)=0
here both are equaled to zero that is, cos x =0 and 2+2 sin x = 0
Still Need Help?
Join the QuestionCove community and study together with friends!
x=arc cos 0 and 2sin x=-2 sin x=-2/2 sin x=-1 x=arc sin -1 x=pi/2 and x=-pi/2
Can't find your answer?
Make a FREE account and ask your own questions, OR help others and earn volunteer hours!
Join our real-time social learning platform and learn together with your friends!
Join our real-time social learning platform and learn together with your friends!
Latest Questions
Subshilava:
I have an issue my mom bought me a 3d cat mold from tj maxx and everytime I fill
1UPSA:
CAN YALL RATE MY SONG https://www.youtube.com/watch?v=b9QtAeJPeOM&list=RDMMnhCC1y
ShikuniShigana:
Alright so. I need some art ideas, or Drawing design ideas for this Character im doing, He's Kinda like based off Vita Carnis+Shefki Shin+Death Angel(From Q
gelphielvr:
hello :] I have to make a model for my biology class for either topic "evolution"
SnowyBreaks:
Question for the staff here, Could you possibly change my name. I'll dm the name
SsTDOGRednek:
Could someone read my essay and give me some criticism?
Yosad930:
still speed studying for dual enrollment macroeconomics, and a few quick question
gelphielvr:
I have a presentation to do In Front of like 50 people does anyone have any tips
5 hours ago
14 Replies
1 Medal
10 hours ago
3 Replies
0 Medals
12 hours ago
16 Replies
2 Medals
14 hours ago
15 Replies
2 Medals
1 day ago
2 Replies
0 Medals
10 hours ago
39 Replies
4 Medals
1 day ago
5 Replies
1 Medal
1 day ago
6 Replies
1 Medal