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Offlineg00ru
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Help me do maths
    #11189554 - 10/05/09 09:35 PM (8 years, 2 months ago)

This is a retarded math question, especially considering I'm in Calc II.  And I'm sure I'll feel like a dumbass when somebody gives me the answer.  But here's my query:

so say you have something like (sin2X)^2, and you want to express it using the half angle identity or the standard trig identity.  Normally with the trig identity you would have (sinX)^2 and you would change it to 1-(cosX)^2.  But that little multiplier just throws me off.  I honestly have no idea how to work with it. 

Could anybody explain to me how that works?  If you need me to clarify the question just ask.

I'm actually surprised I've gotten through so many years of math without learning this :lol:


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Offlineburgatory
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Re: Help me do maths [Re: g00ru]
    #11189578 - 10/05/09 09:40 PM (8 years, 2 months ago)

it's cos you're sinning


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Invisiblepwnasaurus
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Re: Help me do maths [Re: burgatory]
    #11189613 - 10/05/09 09:48 PM (8 years, 2 months ago)

You have sin(2x)^2.

Let 2x = u.

Now you have sin(u)^2.  Apply the rule:

sin(u)^2 + cos(u)^2 = 1

sin(u)^2 = 1 - cos(u)^2

sub u = 2x back in

sin(2x)^2 = 1 - cos(2x)^2


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Offlinestaratsx
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Re: Help me do maths [Re: pwnasaurus]
    #11189656 - 10/05/09 09:55 PM (8 years, 2 months ago)

you will learn to love U substitution...


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Offlineg00ru
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Re: Help me do maths [Re: pwnasaurus]
    #11189659 - 10/05/09 09:55 PM (8 years, 2 months ago)

Okay cool.  So basically I'm just gonna use u substitution whenever I'm confused from now on.

Thx d00d!


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