A community for students.
Here's the question you clicked on:
 0 viewing
pottersheep
 3 years ago
I need Trig Identity help please..! (Grade 12)
How do I prove...
(cos2x/1+sin2x) = tan(pi/4 x)
pottersheep
 3 years ago
I need Trig Identity help please..! (Grade 12) How do I prove... (cos2x/1+sin2x) = tan(pi/4 x)

This Question is Closed

tkhunny
 3 years ago
Best ResponseYou've already chosen the best response.1You have written this: \(\dfrac{\cos(2x)}{1} + \sin(2x) = \tan(\frac{\pi}{4}  x)\). Is this what you intend?

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.0Ohhhhh you are right my mistake!

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.0It should be (cos2x/(1+sin2x) = tan(pi/4 x)

satellite73
 3 years ago
Best ResponseYou've already chosen the best response.0\[\frac{\cos^2(x)}{1+\sin^2(x)}\]?

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.0No, They are not to the power of 2, they are just 2x :)

tkhunny
 3 years ago
Best ResponseYou've already chosen the best response.1Well, it certainly looks like an exercise in double angles. Perhaps expanding all three expressions will lead to something.

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.0I THINK I GOT IT :)

pottersheep
 3 years ago
Best ResponseYou've already chosen the best response.0yay double angles worked~~~!!

tkhunny
 3 years ago
Best ResponseYou've already chosen the best response.1Let's see your work and perhaps we can untangle it. \(\cos(2x) = \cos^{2}(x)  \sin^{2}(x) = 1  2\sin^{2}(x) = 2\cos^{2}(x)  1\) \(\sin(2x) = 2\sin(x)\cos(x)\) You may wish to convert the tangent to sine/cosine. Really, the idea behind these things is to get you to EXPLORE these relationships. Don't expect to see a clear solution right away. Play with it until somthing pops out.

sirm3d
 3 years ago
Best ResponseYou've already chosen the best response.0@pottersheep do you need hint?
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.