Ask
your own question, for FREE!

Mathematics

OpenStudy (anonymous):

need to prove that (sin(x)+sin(3x))\cos(x)+cos(3x))=tan(2x)

Still Need Help?

Join the QuestionCove community and study together with friends!

OpenStudy (anonymous):

sinx+sin3x=2sin(x+3x)/2cos(x-3x)/2 =2sin(4x)/2cos(-2x)/2 =2sin2xcos(-x) cos(-x)=cosx =2sin2xcosx..............A cosx+cos3x=2cos(x+3x)/2cos(x-3x)/2 =2cos(4x)/2cos(-2x)/2 =2cos2xcosx.............B DIVIDING A by B (sinx+sin3x)/cosx+cos3x=(2sin2xcosx)/2cos2xcosx cancelling cosx by cosx & 2 by 2 gives =sin2x/cos2x =tan2x

OpenStudy (anonymous):

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

kassidydaddysgurl:
i need some ideas for this song im trying to write about depression and about the

just now
22 Replies
4 Medals

Dallasbmxboyy:
hey guys so i need some ideas about like what to do for my love of my life and we

34 minutes ago
27 Replies
1 Medal

jessicaCazva:
The table shows the number of books donated to a library each month. Suppose the growth continues exponentially.

47 minutes ago
5 Replies
5 Medals

jessicaCazva:
A virus is spreading exponentially. The initial amount of people infected is 40 and it is increasing at a rate of 5% per day.

24 minutes ago
5 Replies
1 Medal

SIESIE:
A 10.0 mL syringe contains 0.10 g of nitrogen gas at 0.0 degrees Celsius. What is

1 hour ago
4 Replies
1 Medal

KingPizza:
Fill in the blank: _____ trabaja en la oficina y organiza la agenda. A: El ingeni

1 hour ago
3 Replies
0 Medals

Tonycoolkid21:
Article Review: Read and write a two paragraph summary. Due at the end of the class period 4/23/2021 Lennard Gilham u2022 11:59 AM 100 points Spring will so

24 minutes ago
7 Replies
1 Medal

Grande03:
Graphing technology can help us graph quadratic relationships more efficiently than plotting points and graphing by hand.

1 hour ago
2 Replies
0 Medals

rxcklesskaisher:
Mosses were the first plants found on land. Like all other plants, they require water in order to survive, and are often found in very moist places.

1 hour ago
2 Replies
1 Medal

rxcklesskaisher:
Which of the following describes how an autotroph obtains food? a rose bush produ

2 hours ago
8 Replies
0 Medals