anonymous
  • anonymous
show cos2x = 1 - tan^2 (x) / 1 +tan^2 (x)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
do u know how to start?
anonymous
  • anonymous
|dw:1359466433151:dw|
anonymous
  • anonymous
|dw:1359466643501:dw|

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anonymous
  • anonymous
Umm...dont do that...u'll only get cos2x=1...
anonymous
  • anonymous
what is tanx=?i.e what can tanx be written as?
anonymous
  • anonymous
sinx/cosx?
anonymous
  • anonymous
yeah good..so tan^2x = sin^2 x/cos^2 x ?
anonymous
  • anonymous
ya
anonymous
  • anonymous
so nw substitute...and tell me what u get..
anonymous
  • anonymous
1-(sin(^2)x/cos(^2)x / 1+(sin(^2)x/cos(^2)x ?
anonymous
  • anonymous
take lcm..
anonymous
  • anonymous
Simplify more...
anonymous
  • anonymous
i hope dis helps
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anonymous
  • anonymous
@mathnoob1 u got it?
anonymous
  • anonymous
do we use tan^2+1=sec^2 and 1+cot^2 =csc^2 for proving?
anonymous
  • anonymous
U can use any Identity for proving but here as far as I know only this will work...
anonymous
  • anonymous
any tips to know which identity fit most?
anonymous
  • anonymous
there 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=cosx-sinx...this u already know...so try converting the complicated thing in terms of the other side equation....
anonymous
  • anonymous
ok
anonymous
  • anonymous
i got it cos2x/1 = cos2x

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