Qualification > Math

C3 and C4 DOUBTS HERE!!!

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**RoRo**:
How do you integrate the following function sec2xtan2x by substitution method? I need the working please, thank you! :)

elemis:

--- Quote from: The Secret on April 03, 2011, 11:56:29 am ---How do you integrate the following function sec2xtan2x by substitution method? I need the working please, thank you! :)

--- End quote ---

10 minutes.

elemis:



Let u=tanx





Since du=sec2x dx :





Additionally u=tanx hence :





Integrating gives :





Substituting for u gives :

**RoRo**:

--- Quote from: Ari Ben Canaan on April 03, 2011, 02:23:09 pm ---


Let u=tanx





Since du=sec2x dx :





Additionally u=tanx hence :





Integrating gives :





Substituting for u gives :





--- End quote ---

THANK YOUUU!! ;D

mdwael:
Do we have to memorize the expansions of Sin(A+B), Cos(A+B), CosA CosB- SinA Sin B or they'll be given in the formula booklet?
Also does anyone know a helpful website to help me in chapters 6 and 7? (tirgnometry)

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