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#1 will_789

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Posted 23 January 2007 - 11:14 PM

Whats the integral of 2cos2x?

cheers dudes and dudettes

#2 The Wedge Effect

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Posted 23 January 2007 - 11:16 PM

Just use the double angle formulae, and you can integrate more easily from there.

#3 will_789

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Posted 23 January 2007 - 11:24 PM

is it sin2x?

#4 will_789

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Posted 23 January 2007 - 11:28 PM

QUOTE(will_789 @ Jan 23 2007, 11:24 PM) View Post
is it sin2x?

Nope...Jesus...its too late for this maths malarkie. Im off lol

#5 Dave

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Posted 24 January 2007 - 01:39 PM

2cos2x


cos2x = 2cos^2-1

therefore:
2cos2x=4cos^2-2

If i am not here i am somewhere else



#6 dfx

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Posted 24 January 2007 - 02:43 PM

QUOTE(will_789 @ Jan 23 2007, 11:24 PM) View Post
is it sin2x?


Yes.

#7 ad absurdum

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Posted 24 January 2007 - 08:52 PM

Using double angle formulae makes this harder really, in fact it's usually the case that double angle formula is used to get away from stuff involving cos^2 x or sin^2 x.

But yeah, I agree with Will and dfx, sin2x is the right answer.
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