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Mimi_x3Best ResponseYou've already chosen the best response.1
\[ cot2a = 0 => \frac{cos2a}{sin2a} = 0 => cos2a = 0 => 2a = cos(0)\]
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.1
wait i made a typo: \[ 2a = cos^{1}(0)\]
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.1
since you know that \(cos^{1}(0) = 90\)
 one year ago

lsuganoBest ResponseYou've already chosen the best response.0
wait how did cot2a= cos2a/sin2a?
 one year ago

waterineyesBest ResponseYou've already chosen the best response.0
Firstly you should remember that: \[\cos(90) = 0\]
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.1
because \[ cota = \frac{cosa}{sina}\]
 one year ago

waterineyesBest ResponseYou've already chosen the best response.0
\[\large \cot(90^{\circ}) = 0\]
 one year ago

waterineyesBest ResponseYou've already chosen the best response.0
So you can replace 0 with cot(90): \[\cot(2a) = \cot(90)\]
 one year ago

lsuganoBest ResponseYou've already chosen the best response.0
im sorry but isnt cot= 1/tana?
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.1
well you can use that method if you remember whats cot(90)
 one year ago

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

Mimi_x3Best ResponseYou've already chosen the best response.1
yes it because what tana?
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.1
yes it is but whats tan(a) then?*
 one year ago

lsuganoBest ResponseYou've already chosen the best response.0
oh cot also equals to x/y so cos/sin right??
 one year ago

lsuganoBest ResponseYou've already chosen the best response.0
ohhhh okay it makes sense
 one year ago

lsuganoBest ResponseYou've already chosen the best response.0
so i get that cos2a/sin2a = 0 but then what is next?
 one year ago

Mimi_x3Best ResponseYou've already chosen the best response.1
i typed the solution for you already..
 one year ago

waterineyesBest ResponseYou've already chosen the best response.0
Multiply by sin(2a) both the sides..
 one year ago

lsuganoBest ResponseYou've already chosen the best response.0
so it becomes cos2a (sin2a) = 0 (sin2a)
 one year ago

waterineyesBest ResponseYou've already chosen the best response.0
No.. There is one sin(2a) in the denominator too..
 one year ago

waterineyesBest ResponseYou've already chosen the best response.0
Can't you cancel sin(2a) with sin(2a) on left hand side ??
 one year ago

lsuganoBest ResponseYou've already chosen the best response.0
so does it become like this?
 one year ago

lsuganoBest ResponseYou've already chosen the best response.0
oh okay now i get the steps! thank you so much @waterineyes @Mimi_x3
 one year ago
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