A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 3 years ago
what is cot2a=0 Thus 2a=90˚....how did this happen?
anonymous
 3 years ago
what is cot2a=0 Thus 2a=90˚....how did this happen?

This Question is Closed

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1\[ cot2a = 0 => \frac{cos2a}{sin2a} = 0 => cos2a = 0 => 2a = cos(0)\]

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1wait i made a typo: \[ 2a = cos^{1}(0)\]

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1since you know that \(cos^{1}(0) = 90\)

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0wait how did cot2a= cos2a/sin2a?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Firstly you should remember that: \[\cos(90) = 0\]

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1because \[ cota = \frac{cosa}{sina}\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0\[\large \cot(90^{\circ}) = 0\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0So you can replace 0 with cot(90): \[\cot(2a) = \cot(90)\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0im sorry but isnt cot= 1/tana?

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1well you can use that method if you remember whats cot(90)

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Now as trigonometric ratio is same: So you can equate the angles: \[2a = 90\]

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1yes it because what tana?

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1yes it is but whats tan(a) then?*

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0oh cot also equals to x/y so cos/sin right??

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0ohhhh okay it makes sense

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0so i get that cos2a/sin2a = 0 but then what is next?

Mimi_x3
 3 years ago
Best ResponseYou've already chosen the best response.1i typed the solution for you already..

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Multiply by sin(2a) both the sides..

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0so it becomes cos2a (sin2a) = 0 (sin2a)

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0No.. There is one sin(2a) in the denominator too..

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Can't you cancel sin(2a) with sin(2a) on left hand side ??

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0so does it become like this?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0oh okay now i get the steps! thank you so much @waterineyes @Mimi_x3
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.