Integration question

the answer is 3 tanx + c

ive tried substituting cos^2x =u but then you still have sin2t in the equation so you cant differentiate wrt du

use the double angle rule

remember 3/cos(x)^2 = 3sec(x)^2

3/cos^2x = 3sec^2x[br][br]sec^2x = 1+tan^2x

so you got Integral of

3(1+tan^2x)

which you can sort out with quotient rule.

aaah thats what it was thanks

......or you could just use the fact that sec(x)^2 integrates to tan(x)

James_12

so you got Integral of

3(1+tan^2x)

which you can sort out with quotient rule.

What?

Killer_bees

......or you could just use the fact that sec(x)^2 integrates to tan(x)

Yeah, that is the better way. :p:

Was going to say do it by recognition.

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