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lsugano
 3 years ago
what is cot2a=0 Thus 2a=90˚....how did this happen?
lsugano
 3 years ago
what is cot2a=0 Thus 2a=90˚....how did this happen?

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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 \(cos^{1}(0) = 90\)

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

waterineyes
 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 \[ cota = \frac{cosa}{sina}\]

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

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

lsugano
 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)

waterineyes
 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?*

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

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

lsugano
 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..

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

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

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

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

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

lsugano
 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
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