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#1 2007-04-01 22:58:10

fangree01
Member
Registered: 2006-11-13
Posts: 11

Integrating Trig Functions

Hi,

I was wondering if someone could help me with these questions:

a)  ∫2cosx tanx dx
b)  ∫sinx cosx dx
c)  ∫dx/√1-4x²

For a and b I know how to integrate them on their own it's because they are multiplying each other thats getting me.

I would be grateful fpr any help.

Thanks smile

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#2 2007-04-01 23:13:51

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: Integrating Trig Functions

(a) 2cosxtanx = 2sinx

(b) sinxcosx = ½sin2x.

(c) Use the substitution x = ½sinθ.

Last edited by JaneFairfax (2007-04-01 23:14:19)

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