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

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

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

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.1
then \( 2a = 90\)
 2 years ago

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

waterineyes Group TitleBest ResponseYou've already chosen the best response.0
Firstly you should remember that: \[\cos(90) = 0\]
 2 years ago

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

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

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

lsugano Group TitleBest ResponseYou've already chosen the best response.0
im sorry but isnt cot= 1/tana?
 2 years ago

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

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

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.1
yes it because what tana?
 2 years ago

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

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

waterineyes Group TitleBest ResponseYou've already chosen the best response.0
Right..
 2 years ago

lsugano Group TitleBest ResponseYou've already chosen the best response.0
ohhhh okay it makes sense
 2 years ago

lsugano Group TitleBest ResponseYou've already chosen the best response.0
so i get that cos2a/sin2a = 0 but then what is next?
 2 years ago

Mimi_x3 Group TitleBest ResponseYou've already chosen the best response.1
i typed the solution for you already..
 2 years ago

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

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

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

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

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

lsugano Group TitleBest ResponseYou've already chosen the best response.0
oh okay now i get the steps! thank you so much @waterineyes @Mimi_x3
 2 years ago

waterineyes Group TitleBest ResponseYou've already chosen the best response.0
Welcome dear..
 2 years ago
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