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Pure Maths help (Trig Integrals)
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Topic: Pure Maths help (Trig Integrals) (Read 1466 times)
Priya
Newbie
Posts: 39
Reputation: 20
Pure Maths help (Trig Integrals)
«
on:
May 27, 2009, 06:44:42 pm »
Could you tell me what is the integral of sec x... Is it sec x+tan x +c or sec x*tan x
Is using secxtanx in this video
http://www.youtube.com/watch?v=8CHHY-2Ctug&feature=related
@ 2.25 appropriate?
Pls reply...
Thanks for helping me out!
«
Last Edit: May 27, 2009, 07:27:27 pm by Priya
»
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astarmathsandphysics
SF Overlord
Posts: 11271
Reputation: 65534
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Free the exam papers!
Re: Pure Maths help (Trig Integrals)
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Reply #1 on:
May 27, 2009, 07:18:43 pm »
It is ln(secx+tanx)
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Priya
Newbie
Posts: 39
Reputation: 20
Re: Pure Maths help (Trig Integrals)
«
Reply #2 on:
May 27, 2009, 07:36:01 pm »
Thank you!
And I was confusing integration with differentiation in that video. Understood it now... Thanks again!!
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astarmathsandphysics
SF Overlord
Posts: 11271
Reputation: 65534
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Free the exam papers!
Re: Pure Maths help (Trig Integrals)
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Reply #3 on:
May 27, 2009, 07:38:34 pm »
Multiply tanx by (tanx+secx)/(secx+tanx) and expand the brackets. Top is derivative of bottom so substittu u=(tanx+secx) to get du/u then integrate
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IGCSE/GCSE/O & A Level/IB/University Student Forum
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Qualification
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GCE AS & A2 Level
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Subject Doubts
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Math
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Pure Maths help (Trig Integrals)