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mathnoob1
 2 years ago
show cos2x = 1  tan^2 (x) /
1 +tan^2 (x)
mathnoob1
 2 years ago
show cos2x = 1  tan^2 (x) / 1 +tan^2 (x)

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Nikhil619
 2 years ago
Best ResponseYou've already chosen the best response.1do u know how to start?

mathnoob1
 2 years ago
Best ResponseYou've already chosen the best response.0dw:1359466433151:dw

mathnoob1
 2 years ago
Best ResponseYou've already chosen the best response.0dw:1359466643501:dw

Nikhil619
 2 years ago
Best ResponseYou've already chosen the best response.1Umm...dont do that...u'll only get cos2x=1...

Nikhil619
 2 years ago
Best ResponseYou've already chosen the best response.1what is tanx=?i.e what can tanx be written as?

Nikhil619
 2 years ago
Best ResponseYou've already chosen the best response.1yeah good..so tan^2x = sin^2 x/cos^2 x ?

Nikhil619
 2 years ago
Best ResponseYou've already chosen the best response.1so nw substitute...and tell me what u get..

mathnoob1
 2 years ago
Best ResponseYou've already chosen the best response.01(sin(^2)x/cos(^2)x / 1+(sin(^2)x/cos(^2)x ?

mathnoob1
 2 years ago
Best ResponseYou've already chosen the best response.0do we use tan^2+1=sec^2 and 1+cot^2 =csc^2 for proving?

Nikhil619
 2 years ago
Best ResponseYou've already chosen the best response.1U can use any Identity for proving but here as far as I know only this will work...

mathnoob1
 2 years ago
Best ResponseYou've already chosen the best response.0any tips to know which identity fit most?

Nikhil619
 2 years ago
Best ResponseYou've already chosen the best response.1there aren't any methods or anything..see u have 2 sides of a proof right..one side will be some complicated thing...while the other will probably be sumthin u know the direct equation for like here cos2x=cosxsinx...this u already know...so try converting the complicated thing in terms of the other side equation....

mathnoob1
 2 years ago
Best ResponseYou've already chosen the best response.0i got it cos2x/1 = cos2x
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