Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
Eliminate A from each pair of parametric equations
x = 2tan( A/2)
y = cosA
 10 months ago
 10 months ago
Eliminate A from each pair of parametric equations x = 2tan( A/2) y = cosA
 10 months ago
 10 months ago

This Question is Closed

jdoe0001Best ResponseYou've already chosen the best response.1
$$\large{ 2 tan\pmatrix{\frac{a}{2}}=2\pmatrix{\frac{1cos(a)}{sin(a)}}\\ \color{red}{y} = \color{blue}{cos(a)} \ \ \ thus\\ 2tan\pmatrix{\frac{a}{2}}=2\pmatrix{\frac{1y}{sin(a)}} \implies \pmatrix{\frac{22y}{sin(a)}}\\ x=\frac{22y}{sin(a)} \implies \color{blue}{sin(a)} = \color{red}{\frac{22y}{x}} } $$
 10 months ago

jdoe0001Best ResponseYou've already chosen the best response.1
then just use the identity of \(\large sin^2+cos^2 =1\) to get your equation
 10 months ago

AonZBest ResponseYou've already chosen the best response.0
how does \[{ 2 \tan\pmatrix{\frac{a}{2}}=2\pmatrix{\frac{1\cos(a)}{\sin(a)}}\\ }\]
 10 months ago

jdoe0001Best ResponseYou've already chosen the best response.1
http://www.freemathhelp.com/images/halfangles.png halfangle identities, check your textbook formulas, or a formula cheatsheet you may have
 10 months ago

jdoe0001Best ResponseYou've already chosen the best response.1
the picture there shows 2 for tangent, there are 3, at least on my sheet :)
 10 months ago
See more questions >>>
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.