Because i'm too damn tired...(Math help)

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RavenSEAL

Diamond Member
Jan 4, 2010
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I was dragged around all day...i'm out of energy and not in a good mood, hoping you good folks here @ ATOT can help me out. :|

I need to know how to derive Sin3Θ

Anyone that can bother to explain? Thank you!
 
TecHNooB

TecHNooB

Diamond Member
Sep 10, 2005
7,458
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graph it, roughly determine the instantaneous change with respect to theta, construct the proper equation to go with your sketch. actually, that 3 might be hard to pull out from sketching. hrm.
 
C

coxmaster

Diamond Member
Dec 14, 2007
3,017
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Ah, my bad. I see you wanted to know how to do it, not just the answer.

As others have said. Chain rule
 
E

eLiu

Diamond Member
Jun 4, 2001
6,407
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I'm surprised no one has complained about this yet:
The word is DIFFERENTIATE.

Also unless you just learned about derivatives, I don't care how "tired" you are; if you cannot differentiate sin(3x) and/or are incapable of googling, it's time to go ahead and pick up that English major.
 
rcpratt

rcpratt

Lifer
Jul 2, 2009
10,433
110
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eLiu said:
I'm surprised no one has complained about this yet:
The word is DIFFERENTIATE.

Also unless you just learned about derivatives, I don't care how "tired" you are; if you cannot differentiate sin(3x) and/or are incapable of googling, it's time to go ahead and pick up that English major.
Click to expand...
That was kind of my point.
 
DrPizza

DrPizza

Administrator Elite Member Goat Whisperer
Mar 5, 2001
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Having read the OP's posts before, I'm not sure he's bright enough to be in a calculus class. If he is, then asking how to find the derivative of sin(3x) indicates that he's not bright enough to be in a calculus class.

Thus, I've come to the conclusion that what he means is he wants to derive a formula for sin(3x) in terms of sin(x)

He can do his own homework, but tips:
Start with sin(2x + x) and use the sum of two angles formula for sin.
After than, you'll substitute for sin(2x) using the appropriate formula, and cos(2x) using the appropriate formula. For the latter, you've probably learned 3 formulas. Hint: you're trying to end up with nothing but sin(x) terms/factors. Don't use a formula with a cosine in it. Then, after a little simplifying, you'll have a cos^2(x) factor. Simple pythagorean identity to get that one in terms of sin(x). Clean it up a bit & you're done.

10 to 1 your teacher did cos(3x) in class. The answer is very similar for sin(3x). If it's not, you're wrong.
 
R

RagingBITCH

Lifer
Sep 27, 2003
17,618
2
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DrPizza said:
Having read the OP's posts before, I'm not sure he's bright enough to be in a calculus class. If he is, then asking how to find the derivative of sin(3x) indicates that he's not bright enough to be in a calculus class.

Thus, I've come to the conclusion that what he means is he wants to derive a formula for sin(3x) in terms of sin(x)

He can do his own homework, but tips:
Start with sin(2x + x) and use the sum of two angles formula for sin.
After than, you'll substitute for sin(2x) using the appropriate formula, and cos(2x) using the appropriate formula. For the latter, you've probably learned 3 formulas. Hint: you're trying to end up with nothing but sin(x) terms/factors. Don't use a formula with a cosine in it. Then, after a little simplifying, you'll have a cos^2(x) factor. Simple pythagorean identity to get that one in terms of sin(x). Clean it up a bit & you're done.

10 to 1 your teacher did cos(3x) in class. The answer is very similar for sin(3x). If it's not, you're wrong.
Click to expand...

He's not bright enough to be in school.
 
Kromis

Kromis

Diamond Member
Mar 2, 2006
5,214
1
81
DrPizza said:
Having read the OP's posts before, I'm not sure he's bright enough to be in a calculus class. If he is, then asking how to find the derivative of sin(3x) indicates that he's not bright enough to be in a calculus class.

Thus, I've come to the conclusion that what he means is he wants to derive a formula for sin(3x) in terms of sin(x)

He can do his own homework, but tips:
Start with sin(2x + x) and use the sum of two angles formula for sin.
After than, you'll substitute for sin(2x) using the appropriate formula, and cos(2x) using the appropriate formula. For the latter, you've probably learned 3 formulas. Hint: you're trying to end up with nothing but sin(x) terms/factors. Don't use a formula with a cosine in it. Then, after a little simplifying, you'll have a cos^2(x) factor. Simple pythagorean identity to get that one in terms of sin(x). Clean it up a bit & you're done.

10 to 1 your teacher did cos(3x) in class. The answer is very similar for sin(3x). If it's not, you're wrong.
Click to expand...

You go, Dr. Pizza! :biggrin:
 
Wyndru

Wyndru

Diamond Member
Apr 9, 2009
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derive8516970kt7.jpg
 
R

RavenSEAL

Diamond Member
Jan 4, 2010
8,661
3
0
RagingBITCH said:
He's not bright enough to be in school.
Click to expand...

What's with every thread in OT turning into a flame war? Honestly.

You should probably call USF, UCF and FSU to complain, because they've all gladly already said yes to my 3.5 GPA that includes 6 AP classes with all 6 exams passed, including a 5 on AP United States History, World History, Spanish Lang and Lit plus a 4 on AP Literature.
 
C

coxmaster

Diamond Member
Dec 14, 2007
3,017
3
81
RavenSEAL said:
What's with every thread in OT turning into a flame war? Honestly.

You should probably call USF, UCF and FSU to complain, because they've all gladly already said yes to my 3.5 GPA that includes 6 AP classes with all 6 exams passed, including a 5 on AP United States History, World History, Spanish Lang and Lit plus a 4 on AP Literature.
Click to expand...

What are young going to study? I'll meetup with you sometime (somebody needs to confirm if you are as dumb in real life as you are on here)
 
R

RavenSEAL

Diamond Member
Jan 4, 2010
8,661
3
0
coxmaster said:
What are young going to study? I'll meetup with you sometime (somebody needs to confirm if you are as dumb in real life as you are on here)
Click to expand...

Computer information Science with a minor on Spanish, after that applying for AF/Navy officer school, if i don't get admitted to officer school, both of my parents are financial analyst @ Citi Group, they can easily get me a job there.
 
TecHNooB

TecHNooB

Diamond Member
Sep 10, 2005
7,458
1
76
RavenSEAL said:
Computer information Science with a minor on Spanish, after that applying for AF/Navy officer school, if i don't get admitted to officer school, both of my parents are financial analyst @ Citi Group, they can easily get me a job there.
Click to expand...

lol @ banking on parents for job.
 
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